/// <summary>
/// Finds if the given token contains a recognizable namespace and, if so, abbreviates it with its prefix.
/// It also prepares the result in a format useful for serialization.
/// </summary>
internal static String AbbreviateNamespace(String token)
{
//Null or Space token: it's a trick, give empty result
if (token == null || token.Trim() == String.Empty) {
return String.Empty;
}
//Blank token: abbreviate it with "_"
if (token.StartsWith("bnode:")) {
return token.Replace("bnode:", "_:");
}
//Prefixed token: check if it starts with a known prefix, if so just return it
if (RDFNamespaceRegister.GetByPrefix(token.Split(':')[0]) != null) {
return token;
}
//Uri token: search a known namespace, if found replace it with its prefix
String tokenBackup = token;
Boolean abbrev = false;
RDFNamespaceRegister.Instance.Register.ForEach(ns => {
if (!abbrev) {
String nS = ns.ToString();
if (!token.Equals(nS, StringComparison.OrdinalIgnoreCase)) {
if (token.StartsWith(nS)) {
token = token.Replace(nS, ns.NamespacePrefix + ":").TrimEnd(new Char[] { '/' });
//Accept the abbreviation only if it has generated a valid XSD QName
try {
var qn = new RDFTypedLiteral(token, RDFModelEnums.RDFDatatypes.XSD_QNAME);
abbrev = true;
}
catch {
token = tokenBackup;
abbrev = false;
}
}
}
}
});
//Search done, let's analyze results:
if (abbrev) {
return token; //token is a relative or a blank uri
}
if (token.Contains("^^")) { //token is a typedLiteral absolute uri
return token.Replace("^^", "^^<") + ">";
}
return "<" + token + ">"; //token is an absolute uri
}
/// <summary>
/// Parses the current quadruple of the data reader
/// </summary>
public static RDFQuadruple ParseQuadruple(IDataReader fetchedQuadruples) {
if (fetchedQuadruples != null) {
RDFContext qContext = new RDFContext(fetchedQuadruples["Context"].ToString());
RDFResource qSubject = new RDFResource(fetchedQuadruples["Subject"].ToString());
RDFResource qPredicate = new RDFResource(fetchedQuadruples["Predicate"].ToString());
//SPO-flavour quadruple
if (fetchedQuadruples["TripleFlavor"].ToString() == "1") {
RDFResource qObject = new RDFResource(fetchedQuadruples["Object"].ToString());
return new RDFQuadruple(qContext, qSubject, qPredicate, qObject);
}
//SPL-flavour quadruple
String literal = fetchedQuadruples["Object"].ToString();
//PlainLiteral
if (!literal.Contains("^^") || literal.EndsWith("^^") || RDFModelUtilities.GetUriFromString(literal.Substring(literal.LastIndexOf("^^", StringComparison.Ordinal) + 2)) == null) {
RDFPlainLiteral pLit = null;
if (literal.Contains("@")) {
if (!literal.EndsWith("@")) {
Int32 lastAmp = literal.LastIndexOf('@');
pLit = new RDFPlainLiteral(literal.Substring(0, lastAmp), literal.Substring(lastAmp + 1));
}
else {
pLit = new RDFPlainLiteral(literal);
}
}
else {
pLit = new RDFPlainLiteral(literal);
}
return new RDFQuadruple(qContext, qSubject, qPredicate, pLit);
}
//TypedLiteral
String tLitValue = literal.Substring(0, literal.LastIndexOf("^^", StringComparison.Ordinal));
String tLitDatatype = literal.Substring(literal.LastIndexOf("^^", StringComparison.Ordinal) + 2);
RDFDatatype dt = RDFModelUtilities.GetDatatypeFromString(tLitDatatype);
RDFTypedLiteral tLit = new RDFTypedLiteral(tLitValue, dt);
return new RDFQuadruple(qContext, qSubject, qPredicate, tLit);
}
throw new RDFStoreException("Cannot parse quadruple because given \"fetchedQuadruples\" parameter is null.");
}
/// <summary>
/// Parses the given string to return an instance of pattern member
/// </summary>
internal static RDFPatternMember ParseRDFPatternMember(String pMember)
{
if (pMember != null) {
#region Uri
Uri testUri;
if (Uri.TryCreate(pMember, UriKind.Absolute, out testUri)) {
return new RDFResource(pMember);
}
#endregion
#region Plain Literal
if (!pMember.Contains("^^") ||
pMember.EndsWith("^^") ||
RDFModelUtilities.GetUriFromString(pMember.Substring(pMember.LastIndexOf("^^", StringComparison.Ordinal) + 2)) == null) {
RDFPlainLiteral pLit = null;
if (RDFNTriples.regexLPL.Match(pMember).Success) {
String pLitVal = pMember.Substring(0, pMember.LastIndexOf("@", StringComparison.Ordinal));
String pLitLng = pMember.Substring(pMember.LastIndexOf("@", StringComparison.Ordinal) + 1);
pLit = new RDFPlainLiteral(pLitVal, pLitLng);
}
else {
pLit = new RDFPlainLiteral(pMember);
}
return pLit;
}
#endregion
#region Typed Literal
String tLitValue = pMember.Substring(0, pMember.LastIndexOf("^^", StringComparison.Ordinal));
String tLitDatatype = pMember.Substring(pMember.LastIndexOf("^^", StringComparison.Ordinal) + 2);
RDFModelEnums.RDFDatatypes dt = RDFModelUtilities.GetDatatypeFromString(tLitDatatype);
RDFTypedLiteral tLit = new RDFTypedLiteral(tLitValue, dt);
return tLit;
#endregion
}
throw new RDFQueryException("Cannot parse pattern member because given \"pMember\" parameter is null.");
}
/// <summary>
/// Parses the given string to return an instance of pattern member
/// </summary>
public static RDFPatternMember ParseRDFPatternMember(String pMember) {
if (pMember != null) {
#region Uri
Uri testUri;
if (Uri.TryCreate(pMember, UriKind.Absolute, out testUri)) {
return new RDFResource(pMember);
}
#endregion
#region Plain Literal
if (!pMember.Contains("^^") || pMember.EndsWith("^^") ||
RDFModelUtilities.GetUriFromString(pMember.Substring(pMember.LastIndexOf("^^", StringComparison.Ordinal) + 2)) == null) {
RDFPlainLiteral pLit = null;
if (pMember.Contains("@")) {
if (!pMember.EndsWith("@")) {
Int32 lastAmp = pMember.LastIndexOf('@');
pLit = new RDFPlainLiteral(pMember.Substring(0, lastAmp), pMember.Substring(lastAmp + 1));
}
else {
pLit = new RDFPlainLiteral(pMember);
}
}
else {
pLit = new RDFPlainLiteral(pMember);
}
return pLit;
}
#endregion
#region Typed Literal
String tLitValue = pMember.Substring(0, pMember.LastIndexOf("^^", StringComparison.Ordinal));
String tLitDatatype = pMember.Substring(pMember.LastIndexOf("^^", StringComparison.Ordinal) + 2);
RDFDatatype dt = RDFModelUtilities.GetDatatypeFromString(tLitDatatype);
RDFTypedLiteral tLit = new RDFTypedLiteral(tLitValue, dt);
return tLit;
#endregion
}
throw new RDFQueryException("Cannot parse pattern member because given \"pMember\" parameter is null.");
}
/// <summary>
/// Deserializes the given N-Triples stream to a graph.
/// </summary>
internal static RDFGraph Deserialize(Stream inputStream)
{
Int64 ntripleIndex = 0;
try
{
#region deserialize
using (StreamReader sr = new StreamReader(inputStream, Encoding.ASCII))
{
RDFGraph result = new RDFGraph();
String ntriple = String.Empty;
String[] tokens = new String[3];
RDFResource S = null;
RDFResource P = null;
RDFResource O = null;
RDFLiteral L = null;
while ((ntriple = sr.ReadLine()) != null)
{
ntripleIndex++;
#region sanitize & tokenize
//Cleanup previous data
S = null;
tokens[0] = String.Empty;
P = null;
tokens[1] = String.Empty;
O = null;
L = null;
tokens[2] = String.Empty;
//Preliminary sanitizations: clean trailing space-like chars
ntriple = ntriple.Trim(new Char[] { ' ', '\t', '\r', '\n' });
//Skip empty or comment lines
if (ntriple == String.Empty || ntriple.StartsWith("#"))
{
continue;
}
//Tokenizes the sanitized triple
tokens = TokenizeNTriple(ntriple);
#endregion
#region subj
String subj = tokens[0].TrimStart(new Char[] { '<' })
.TrimEnd(new Char[] { '>' })
.Replace("_:", "bnode:");
S = new RDFResource(RDFModelUtilities.ASCII_To_Unicode(subj));
#endregion
#region pred
String pred = tokens[1].TrimStart(new Char[] { '<' })
.TrimEnd(new Char[] { '>' });
P = new RDFResource(RDFModelUtilities.ASCII_To_Unicode(pred));
#endregion
#region object
if (tokens[2].StartsWith("<") ||
tokens[2].StartsWith("bnode:") ||
tokens[2].StartsWith("_:"))
{
String obj = tokens[2].TrimStart(new Char[] { '<' })
.TrimEnd(new Char[] { '>' })
.Replace("_:", "bnode:")
.Trim(new Char[] { ' ', '\n', '\t', '\r' });
O = new RDFResource(RDFModelUtilities.ASCII_To_Unicode(obj));
}
#endregion
#region literal
else
{
#region sanitize
tokens[2] = regexSqt.Replace(tokens[2], String.Empty);
tokens[2] = regexEqt.Replace(tokens[2], String.Empty);
tokens[2] = tokens[2].Replace("\\\\", "\\")
.Replace("\\\"", "\"")
.Replace("\\n", "\n")
.Replace("\\t", "\t")
.Replace("\\r", "\r");
tokens[2] = RDFModelUtilities.ASCII_To_Unicode(tokens[2]);
#endregion
#region plain literal
if (!tokens[2].Contains("^^") ||
tokens[2].EndsWith("^^") ||
tokens[2].Substring(tokens[2].LastIndexOf("^^", StringComparison.Ordinal) + 2, 1) != "<")
{
if (regexLPL.Match(tokens[2]).Success)
{
tokens[2] = tokens[2].Replace("\"@", "@");
String pLitValue = tokens[2].Substring(0, tokens[2].LastIndexOf("@", StringComparison.Ordinal));
String pLitLang = tokens[2].Substring(tokens[2].LastIndexOf("@", StringComparison.Ordinal) + 1);
L = new RDFPlainLiteral(HttpUtility.HtmlDecode(pLitValue), pLitLang);
}
else
{
L = new RDFPlainLiteral(HttpUtility.HtmlDecode(tokens[2]));
}
}
#endregion
#region typed literal
else
{
tokens[2] = tokens[2].Replace("\"^^", "^^");
String tLitValue = tokens[2].Substring(0, tokens[2].LastIndexOf("^^", StringComparison.Ordinal));
String tLitDatatype = tokens[2].Substring(tokens[2].LastIndexOf("^^", StringComparison.Ordinal) + 2)
.TrimStart(new Char[] { '<' })
.TrimEnd(new Char[] { '>' });
RDFModelEnums.RDFDatatypes dt = RDFModelUtilities.GetDatatypeFromString(tLitDatatype);
L = new RDFTypedLiteral(HttpUtility.HtmlDecode(tLitValue), dt);
}
#endregion
}
#endregion
#region addtriple
if (O != null)
{
result.AddTriple(new RDFTriple(S, P, O));
}
else
{
result.AddTriple(new RDFTriple(S, P, L));
}
#endregion
}
return(result);
}
#endregion
}
catch (Exception ex)
{
throw new RDFModelException("Cannot deserialize N-Triples (line " + ntripleIndex + ") because: " + ex.Message, ex);
}
}
/// <summary>
/// Validates the value of the given typed literal against the category of its datatype
/// </summary>
internal static Boolean ValidateTypedLiteral(RDFTypedLiteral typedLiteral) {
if (typedLiteral != null) {
Boolean validateResponse = true;
switch (typedLiteral.Datatype.Category) {
//STRING TYPES
case RDFModelEnums.RDFDatatypeCategory.String:
//ANYURI
if (typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "anyURI"))) {
Uri outUri;
if (!Uri.TryCreate(typedLiteral.Value, UriKind.Absolute, out outUri)) {
validateResponse = false;
}
}
//XML_LITERAL
else if (typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.RDF.PREFIX, "XMLLiteral"))) {
try {
XDocument.Parse(typedLiteral.Value);
}
catch {
validateResponse = false;
}
}
//NAME
else if (typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "Name"))) {
try {
XmlConvert.VerifyName(typedLiteral.Value);
}
catch {
validateResponse = false;
}
}
//NCNAME
else if (typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "NCName"))) {
try {
XmlConvert.VerifyNCName(typedLiteral.Value);
}
catch {
validateResponse = false;
}
}
//TOKEN
else if (typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "token"))) {
try {
XmlConvert.VerifyTOKEN(typedLiteral.Value);
}
catch {
validateResponse = false;
}
}
//NMTOKEN
else if (typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "NMToken"))) {
try {
XmlConvert.VerifyNMTOKEN(typedLiteral.Value);
}
catch {
validateResponse = false;
}
}
//NORMALIZED_STRING
else if (typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "normalizedString"))) {
if (typedLiteral.Value.Contains('\r') || typedLiteral.Value.Contains('\n') || typedLiteral.Value.Contains('\t')) {
validateResponse = false;
}
}
//LANGUAGE
else if (typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "language"))) {
if (!Regex.IsMatch(typedLiteral.Value, "^[a-zA-Z]+([\\-][a-zA-Z0-9]+)*$")) {
validateResponse = false;
}
}
//BASE64_BINARY
else if (typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "base64Binary"))) {
try {
Convert.FromBase64String(typedLiteral.Value);
}
catch {
validateResponse = false;
}
}
//HEX_BINARY
else if (typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "hexBinary"))) {
if ((typedLiteral.Value.Length % 2 != 0) || (!Regex.IsMatch(typedLiteral.Value, @"^[a-fA-F0-9]+$"))) {
validateResponse = false;
}
}
break;
//BOOLEAN TYPES
case RDFModelEnums.RDFDatatypeCategory.Boolean:
Boolean outBool;
if (!Boolean.TryParse(typedLiteral.Value, out outBool)) {
validateResponse = false;
}
break;
//DATETIME TYPES
case RDFModelEnums.RDFDatatypeCategory.DateTime:
//DATETIME
if (typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "dateTime"))) {
try {
DateTime.ParseExact(typedLiteral.Value, "yyyy-MM-ddTHH:mm:ssK", CultureInfo.InvariantCulture);
}
catch {
try {
DateTime.ParseExact(typedLiteral.Value, "yyyy-MM-ddTHH:mm:ss", CultureInfo.InvariantCulture);
}
catch {
validateResponse = false;
}
}
}
//DATE
else if (typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "date"))) {
try {
DateTime.ParseExact(typedLiteral.Value, "yyyy-MM-ddK", CultureInfo.InvariantCulture);
}
catch {
try {
DateTime.ParseExact(typedLiteral.Value, "yyyy-MM-dd", CultureInfo.InvariantCulture);
}
catch {
validateResponse = false;
}
}
}
//TIME
else if (typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "time"))) {
try {
DateTime.ParseExact(typedLiteral.Value, "HH:mm:ssK", CultureInfo.InvariantCulture);
}
catch {
try {
DateTime.ParseExact(typedLiteral.Value, "HH:mm:ss", CultureInfo.InvariantCulture);
}
catch {
validateResponse = false;
}
}
}
//G_MONTH_DAY
else if (typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "gMonthDay"))) {
try {
DateTime.ParseExact(typedLiteral.Value, "--MM-ddK", CultureInfo.InvariantCulture);
}
catch {
try {
DateTime.ParseExact(typedLiteral.Value, "--MM-dd", CultureInfo.InvariantCulture);
}
catch {
validateResponse = false;
}
}
}
//G_YEAR_MONTH
else if (typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "gYearMonth"))) {
try {
DateTime.ParseExact(typedLiteral.Value, "yyyy-MMK", CultureInfo.InvariantCulture);
}
catch {
try {
DateTime.ParseExact(typedLiteral.Value, "yyyy-MM", CultureInfo.InvariantCulture);
}
catch {
validateResponse = false;
}
}
}
//G_YEAR
else if (typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "gYear"))) {
try {
DateTime.ParseExact(typedLiteral.Value, "yyyyK", CultureInfo.InvariantCulture);
}
catch {
try {
DateTime.ParseExact(typedLiteral.Value, "yyyy", CultureInfo.InvariantCulture);
}
catch {
validateResponse = false;
}
}
}
//G_MONTH
else if (typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "gMonth"))) {
try {
DateTime.ParseExact(typedLiteral.Value, "MMK", CultureInfo.InvariantCulture);
}
catch {
try {
DateTime.ParseExact(typedLiteral.Value, "MM", CultureInfo.InvariantCulture);
}
catch {
validateResponse = false;
}
}
}
//G_DAY
else if (typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "gDay"))) {
try {
DateTime.ParseExact(typedLiteral.Value, "ddK", CultureInfo.InvariantCulture);
}
catch {
try {
DateTime.ParseExact(typedLiteral.Value, "dd", CultureInfo.InvariantCulture);
}
catch {
validateResponse = false;
}
}
}
break;
//TIMESPAN TYPES
case RDFModelEnums.RDFDatatypeCategory.TimeSpan:
try {
XmlConvert.ToTimeSpan(typedLiteral.Value);
}
catch {
validateResponse = false;
}
break;
//NUMERIC TYPES
case RDFModelEnums.RDFDatatypeCategory.Numeric:
Decimal outDecimal;
if (Decimal.TryParse(typedLiteral.Value, NumberStyles.Number, CultureInfo.InvariantCulture, out outDecimal)) {
//INTEGER
if (typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "integer")) ||
typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "int")) ||
typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "positiveInteger")) ||
typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "negativeInteger")) ||
typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "nonPositiveInteger")) ||
typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "nonNegativeInteger"))) {
Int32 outInteger;
if (Int32.TryParse(typedLiteral.Value, NumberStyles.Number, CultureInfo.InvariantCulture, out outInteger)) {
//SUB-INTEGER
if(typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "positiveInteger")) ||
typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "nonNegativeInteger"))) {
if (outInteger < 0) {
validateResponse = false;
}
}
else if (typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "negativeInteger")) ||
typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "nonPositiveInteger"))) {
if (outInteger >= 0) {
validateResponse = false;
}
}
}
else {
validateResponse = false;
}
}
//LONG
else if (typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "long"))) {
Int64 outlong;
if (!Int64.TryParse(typedLiteral.Value, NumberStyles.Number, CultureInfo.InvariantCulture, out outlong)) {
validateResponse = false;
}
}
//SHORT
else if (typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "short"))) {
Int16 outShort;
if (!Int16.TryParse(typedLiteral.Value, NumberStyles.Number, CultureInfo.InvariantCulture, out outShort)) {
validateResponse = false;
}
}
//FLOAT
else if (typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "float"))) {
Single outFloat;
if (!Single.TryParse(typedLiteral.Value, NumberStyles.Number, CultureInfo.InvariantCulture, out outFloat)) {
validateResponse = false;
}
}
//DOUBLE
else if (typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "double"))) {
Double outDouble;
if (!Double.TryParse(typedLiteral.Value, NumberStyles.Number, CultureInfo.InvariantCulture, out outDouble)) {
validateResponse = false;
}
}
//BYTE
else if (typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "byte"))) {
SByte outSByte;
if (!SByte.TryParse(typedLiteral.Value, NumberStyles.Number, CultureInfo.InvariantCulture, out outSByte)) {
validateResponse = false;
}
}
//UNSIGNED TYPES
else if (typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "unsignedByte")) ||
typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "unsignedShort")) ||
typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "unsignedInt")) ||
typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "unsignedLong"))) {
//UNSIGNED BYTE
if (typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "unsignedByte"))) {
Byte outByte;
if (!Byte.TryParse(typedLiteral.Value, NumberStyles.Number, CultureInfo.InvariantCulture, out outByte)) {
validateResponse = false;
}
}
//UNSIGNED SHORT
else if (typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "unsignedShort"))) {
UInt16 outUShort;
if (!UInt16.TryParse(typedLiteral.Value, NumberStyles.Number, CultureInfo.InvariantCulture, out outUShort)) {
validateResponse = false;
}
}
//UNSIGNED INT
else if (typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "unsignedInt"))) {
UInt32 outUInt;
if (!UInt32.TryParse(typedLiteral.Value, NumberStyles.Number, CultureInfo.InvariantCulture, out outUInt)) {
validateResponse = false;
}
}
//UNSIGNED LONG
else if (typedLiteral.Datatype.Equals(RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.XSD.PREFIX, "unsignedLong"))) {
UInt64 outULong;
if (!UInt64.TryParse(typedLiteral.Value, NumberStyles.Number, CultureInfo.InvariantCulture, out outULong)) {
validateResponse = false;
}
}
}
}
else {
validateResponse = false;
}
break;
}
return validateResponse;
}
throw new RDFModelException("Cannot validate RDFTypedLiteral because given \"typedLiteral\" parameter is null.");
}
/// <summary>
/// Validates the value of the given typed literal against its datatype
/// </summary>
internal static Boolean ValidateTypedLiteral(RDFTypedLiteral typedLiteral)
{
if (typedLiteral != null) {
#region STRING CATEGORY
//LITERAL / STRING
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.RDFS_LITERAL) ||
typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_STRING)) {
return true;
}
//XML_LITERAL
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.RDF_XMLLITERAL)) {
try {
XDocument.Parse(typedLiteral.Value);
return true;
}
catch {
return false;
}
}
//ANYURI
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_ANYURI)) {
Uri outUri;
if (Uri.TryCreate(typedLiteral.Value, UriKind.Absolute, out outUri)) {
typedLiteral.Value = Convert.ToString(outUri);
return true;
}
return false;
}
//NAME
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_NAME)) {
try {
XmlConvert.VerifyName(typedLiteral.Value);
return true;
}
catch {
return false;
}
}
//QNAME
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_QNAME)) {
var prefixedQName = typedLiteral.Value.Split(':');
if (prefixedQName.Length == 1) {
try {
XmlConvert.VerifyNCName(prefixedQName[0]);
return true;
}
catch {
return false;
}
}
else if(prefixedQName.Length == 2) {
try {
XmlConvert.VerifyNCName(prefixedQName[0]);
XmlConvert.VerifyNCName(prefixedQName[1]);
return true;
}
catch {
return false;
}
}
else {
return false;
}
}
//NCNAME / ID
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_NCNAME) ||
typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_ID)) {
try {
XmlConvert.VerifyNCName(typedLiteral.Value);
return true;
}
catch {
return false;
}
}
//TOKEN
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_TOKEN)) {
try {
XmlConvert.VerifyTOKEN(typedLiteral.Value);
return true;
}
catch {
return false;
}
}
//NMTOKEN
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_NMTOKEN)) {
try {
XmlConvert.VerifyNMTOKEN(typedLiteral.Value);
return true;
}
catch {
return false;
}
}
//NORMALIZED_STRING
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_NORMALIZEDSTRING)) {
if (typedLiteral.Value.IndexOfAny(new Char[] { '\n', '\r', '\t' }) == -1) {
return true;
}
else {
return false;
}
}
//LANGUAGE
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_LANGUAGE)) {
if (Regex.IsMatch(typedLiteral.Value, "^[a-zA-Z]{1,8}(-[a-zA-Z0-9]{1,8})*$")) {
return true;
}
else {
return false;
}
}
//BASE64_BINARY
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_BASE64BINARY)) {
try {
Convert.FromBase64String(typedLiteral.Value);
return true;
}
catch {
return false;
}
}
//HEX_BINARY
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_HEXBINARY)) {
if (Regex.IsMatch(typedLiteral.Value, @"^([0-9a-fA-F]{2})*$")) {
return true;
}
else {
return false;
}
}
#endregion
#region BOOLEAN CATEGORY
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_BOOLEAN)) {
Boolean outBool;
if (Boolean.TryParse(typedLiteral.Value, out outBool)) {
typedLiteral.Value = (outBool ? "true" : "false");
}
else {
//Even if lexical space of XSD:BOOLEAN allows 1/0,
//it must be converted to true/false value space
if (typedLiteral.Value.Equals("1")) {
typedLiteral.Value = "true";
}
else if(typedLiteral.Value.Equals("0")) {
typedLiteral.Value = "false";
}
else {
return false;
}
}
return true;
}
#endregion
#region DATETIME CATEGORY
//DATETIME
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_DATETIME)) {
DateTime parsedDateTime;
if (DateTime.TryParseExact(typedLiteral.Value, "yyyy-MM-ddTHH:mm:ss.FFFFFFFK", CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal, out parsedDateTime)) {
typedLiteral.Value = parsedDateTime.ToString("yyyy-MM-ddTHH:mm:ss.FFFFFFF", CultureInfo.InvariantCulture);
return true;
}
else if (DateTime.TryParseExact(typedLiteral.Value, "yyyy-MM-ddTHH:mm:ss.FFFFFFF", CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal, out parsedDateTime)) {
typedLiteral.Value = parsedDateTime.ToString("yyyy-MM-ddTHH:mm:ss.FFFFFFF", CultureInfo.InvariantCulture);
return true;
}
else if (DateTime.TryParseExact(typedLiteral.Value, "yyyy-MM-ddTHH:mm:ssK", CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal, out parsedDateTime)) {
typedLiteral.Value = parsedDateTime.ToString("yyyy-MM-ddTHH:mm:ss", CultureInfo.InvariantCulture);
return true;
}
else if (DateTime.TryParseExact(typedLiteral.Value, "yyyy-MM-ddTHH:mm:ss", CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal, out parsedDateTime)) {
typedLiteral.Value = parsedDateTime.ToString("yyyy-MM-ddTHH:mm:ss", CultureInfo.InvariantCulture);
return true;
}
else {
return false;
}
}
//DATE
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_DATE)) {
DateTime parsedDateTime;
if (DateTime.TryParseExact(typedLiteral.Value, "yyyy-MM-ddK", CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal, out parsedDateTime)) {
typedLiteral.Value = parsedDateTime.ToString("yyyy-MM-dd", CultureInfo.InvariantCulture);
return true;
}
else if (DateTime.TryParseExact(typedLiteral.Value, "yyyy-MM-dd", CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal, out parsedDateTime)) {
typedLiteral.Value = parsedDateTime.ToString("yyyy-MM-dd", CultureInfo.InvariantCulture);
return true;
}
else {
return false;
}
}
//TIME
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_TIME)) {
DateTime parsedDateTime;
if (DateTime.TryParseExact(typedLiteral.Value, "HH:mm:ss.FFFFFFFK", CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal, out parsedDateTime)) {
typedLiteral.Value = parsedDateTime.ToString("HH:mm:ss.FFFFFFF", CultureInfo.InvariantCulture);
return true;
}
else if (DateTime.TryParseExact(typedLiteral.Value, "HH:mm:ss.FFFFFFF", CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal, out parsedDateTime)) {
typedLiteral.Value = parsedDateTime.ToString("HH:mm:ss.FFFFFFF", CultureInfo.InvariantCulture);
return true;
}
else if (DateTime.TryParseExact(typedLiteral.Value, "HH:mm:ssK", CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal, out parsedDateTime)) {
typedLiteral.Value = parsedDateTime.ToString("HH:mm:ss", CultureInfo.InvariantCulture);
return true;
}
else if (DateTime.TryParseExact(typedLiteral.Value, "HH:mm:ss", CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal, out parsedDateTime)) {
typedLiteral.Value = parsedDateTime.ToString("HH:mm:ss", CultureInfo.InvariantCulture);
return true;
}
else {
return false;
}
}
//G_MONTH_DAY
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_GMONTHDAY)) {
DateTime parsedDateTime;
if (DateTime.TryParseExact(typedLiteral.Value, "--MM-ddK", CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal, out parsedDateTime)) {
typedLiteral.Value = parsedDateTime.ToString("--MM-dd", CultureInfo.InvariantCulture);
return true;
}
else if (DateTime.TryParseExact(typedLiteral.Value, "--MM-dd", CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal, out parsedDateTime)) {
typedLiteral.Value = parsedDateTime.ToString("--MM-dd", CultureInfo.InvariantCulture);
return true;
}
else {
return false;
}
}
//G_YEAR_MONTH
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_GYEARMONTH)) {
DateTime parsedDateTime;
if (DateTime.TryParseExact(typedLiteral.Value, "yyyy-MMK", CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal, out parsedDateTime)) {
typedLiteral.Value = parsedDateTime.ToString("yyyy-MM", CultureInfo.InvariantCulture);
return true;
}
else if (DateTime.TryParseExact(typedLiteral.Value, "yyyy-MM", CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal, out parsedDateTime)) {
typedLiteral.Value = parsedDateTime.ToString("yyyy-MM", CultureInfo.InvariantCulture);
return true;
}
else {
return false;
}
}
//G_YEAR
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_GYEAR)) {
DateTime parsedDateTime;
if (DateTime.TryParseExact(typedLiteral.Value, "yyyyK", CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal, out parsedDateTime)) {
typedLiteral.Value = parsedDateTime.ToString("yyyy", CultureInfo.InvariantCulture);
return true;
}
else if (DateTime.TryParseExact(typedLiteral.Value, "yyyy", CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal, out parsedDateTime)) {
typedLiteral.Value = parsedDateTime.ToString("yyyy", CultureInfo.InvariantCulture);
return true;
}
else {
return false;
}
}
//G_MONTH
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_GMONTH)) {
DateTime parsedDateTime;
if (DateTime.TryParseExact(typedLiteral.Value, "MMK", CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal, out parsedDateTime)) {
typedLiteral.Value = parsedDateTime.ToString("MM", CultureInfo.InvariantCulture);
return true;
}
else if (DateTime.TryParseExact(typedLiteral.Value, "MM", CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal, out parsedDateTime)) {
typedLiteral.Value = parsedDateTime.ToString("MM", CultureInfo.InvariantCulture);
return true;
}
else {
return false;
}
}
//G_DAY
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_GDAY)) {
DateTime parsedDateTime;
if (DateTime.TryParseExact(typedLiteral.Value, "ddK", CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal, out parsedDateTime)) {
typedLiteral.Value = parsedDateTime.ToString("dd", CultureInfo.InvariantCulture);
return true;
}
else if (DateTime.TryParseExact(typedLiteral.Value, "dd", CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal, out parsedDateTime)) {
typedLiteral.Value = parsedDateTime.ToString("dd", CultureInfo.InvariantCulture);
return true;
}
else {
return false;
}
}
#endregion
#region TIMESPAN CATEGORY
//DURATION
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_DURATION)) {
try {
XmlConvert.ToTimeSpan(typedLiteral.Value);
return true;
}
catch {
return false;
}
}
#endregion
#region NUMERIC CATEGORY
//DECIMAL
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_DECIMAL)) {
Decimal outDecimal;
if (Decimal.TryParse(typedLiteral.Value, NumberStyles.Integer | NumberStyles.AllowDecimalPoint, CultureInfo.InvariantCulture, out outDecimal)) {
typedLiteral.Value = Convert.ToString(outDecimal, CultureInfo.InvariantCulture);
return true;
}
else {
return false;
}
}
//DOUBLE
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_DOUBLE)) {
Double outDouble;
if (Double.TryParse(typedLiteral.Value, NumberStyles.Float, CultureInfo.InvariantCulture, out outDouble)) {
typedLiteral.Value = Convert.ToString(outDouble, CultureInfo.InvariantCulture);
return true;
}
else {
return false;
}
}
//FLOAT
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_FLOAT)) {
Single outFloat;
if (Single.TryParse(typedLiteral.Value, NumberStyles.Float, CultureInfo.InvariantCulture, out outFloat)) {
typedLiteral.Value = Convert.ToString(outFloat, CultureInfo.InvariantCulture);
return true;
}
else {
return false;
}
}
//INTEGER
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_INTEGER)) {
Decimal outInteger;
if (Decimal.TryParse(typedLiteral.Value, NumberStyles.Integer, CultureInfo.InvariantCulture, out outInteger)) {
typedLiteral.Value = Convert.ToString(outInteger, CultureInfo.InvariantCulture);
return true;
}
else {
return false;
}
}
//LONG
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_LONG)) {
Int64 outLong;
if (Int64.TryParse(typedLiteral.Value, NumberStyles.Integer, CultureInfo.InvariantCulture, out outLong)) {
typedLiteral.Value = Convert.ToString(outLong, CultureInfo.InvariantCulture);
return true;
}
else {
return false;
}
}
//INT
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_INT)) {
Int32 outInt;
if (Int32.TryParse(typedLiteral.Value, NumberStyles.Integer, CultureInfo.InvariantCulture, out outInt)) {
typedLiteral.Value = Convert.ToString(outInt, CultureInfo.InvariantCulture);
return true;
}
else {
return false;
}
}
//SHORT
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_SHORT)) {
Int16 outShort;
if (Int16.TryParse(typedLiteral.Value, NumberStyles.Integer, CultureInfo.InvariantCulture, out outShort)) {
typedLiteral.Value = Convert.ToString(outShort, CultureInfo.InvariantCulture);
return true;
}
else {
return false;
}
}
//BYTE
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_BYTE)) {
SByte outSByte;
if (SByte.TryParse(typedLiteral.Value, NumberStyles.Integer, CultureInfo.InvariantCulture, out outSByte)) {
typedLiteral.Value = Convert.ToString(outSByte, CultureInfo.InvariantCulture);
return true;
}
else {
return false;
}
}
//UNSIGNED LONG
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_UNSIGNEDLONG)) {
UInt64 outULong;
if (UInt64.TryParse(typedLiteral.Value, NumberStyles.Integer, CultureInfo.InvariantCulture, out outULong)) {
typedLiteral.Value = Convert.ToString(outULong, CultureInfo.InvariantCulture);
return true;
}
else {
return false;
}
}
//UNSIGNED INT
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_UNSIGNEDINT)) {
UInt32 outUInt;
if (UInt32.TryParse(typedLiteral.Value, NumberStyles.Integer, CultureInfo.InvariantCulture, out outUInt)) {
typedLiteral.Value = Convert.ToString(outUInt, CultureInfo.InvariantCulture);
return true;
}
else {
return false;
}
}
//UNSIGNED SHORT
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_UNSIGNEDSHORT)) {
UInt16 outUShort;
if (UInt16.TryParse(typedLiteral.Value, NumberStyles.Integer, CultureInfo.InvariantCulture, out outUShort)) {
typedLiteral.Value = Convert.ToString(outUShort, CultureInfo.InvariantCulture);
return true;
}
else {
return false;
}
}
//UNSIGNED BYTE
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_UNSIGNEDBYTE)) {
Byte outByte;
if (Byte.TryParse(typedLiteral.Value, NumberStyles.Integer, CultureInfo.InvariantCulture, out outByte)) {
typedLiteral.Value = Convert.ToString(outByte, CultureInfo.InvariantCulture);
return true;
}
else {
return false;
}
}
//NON-POSITIVE INTEGER [Decimal.MinValue, 0]
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_NONPOSITIVEINTEGER)) {
Decimal outNPInteger;
if (Decimal.TryParse(typedLiteral.Value, NumberStyles.Integer, CultureInfo.InvariantCulture, out outNPInteger)) {
typedLiteral.Value = Convert.ToString(outNPInteger, CultureInfo.InvariantCulture);
if (outNPInteger > 0) {
return false;
}
}
else {
return false;
}
return true;
}
//NEGATIVE INTEGER [Decimal.MinValue, -1]
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_NEGATIVEINTEGER)) {
Decimal outNInteger;
if (Decimal.TryParse(typedLiteral.Value, NumberStyles.Integer, CultureInfo.InvariantCulture, out outNInteger)) {
typedLiteral.Value = Convert.ToString(outNInteger, CultureInfo.InvariantCulture);
if (outNInteger > -1) {
return false;
}
}
else {
return false;
}
return true;
}
//NON-NEGATIVE INTEGER [0, Decimal.MaxValue]
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_NONNEGATIVEINTEGER)) {
Decimal outNNInteger;
if (Decimal.TryParse(typedLiteral.Value, NumberStyles.Integer, CultureInfo.InvariantCulture, out outNNInteger)) {
typedLiteral.Value = Convert.ToString(outNNInteger, CultureInfo.InvariantCulture);
if (outNNInteger < 0) {
return false;
}
}
else {
return false;
}
return true;
}
//POSITIVE INTEGER [1, Decimal.MaxValue]
if (typedLiteral.Datatype.Equals(RDFModelEnums.RDFDatatypes.XSD_POSITIVEINTEGER)) {
Decimal outPInteger;
if (Decimal.TryParse(typedLiteral.Value, NumberStyles.Integer, CultureInfo.InvariantCulture, out outPInteger)) {
typedLiteral.Value = Convert.ToString(outPInteger, CultureInfo.InvariantCulture);
if (outPInteger < 1) {
return false;
}
}
else {
return false;
}
return true;
}
#endregion
}
throw new RDFModelException("Cannot validate RDFTypedLiteral because given \"typedLiteral\" parameter is null.");
}
/// <summary>
/// Given an element representing a RDF container, iterates on its constituent elements
/// to build its standard reification triples.
/// </summary>
internal static void ParseContainerElements(RDFModelEnums.RDFContainerTypes contType, XmlNode container,
RDFResource subj, RDFResource pred, RDFGraph result) {
//Attach the container as the blank object of the current pred
RDFResource obj = new RDFResource();
result.AddTriple(new RDFTriple(subj, pred, obj));
//obj -> rdf:type -> rdf:[Bag|Seq|Alt]
switch (contType) {
case RDFModelEnums.RDFContainerTypes.Bag:
result.AddTriple(new RDFTriple(obj, RDFVocabulary.RDF.TYPE, RDFVocabulary.RDF.BAG));
break;
case RDFModelEnums.RDFContainerTypes.Seq:
result.AddTriple(new RDFTriple(obj, RDFVocabulary.RDF.TYPE, RDFVocabulary.RDF.SEQ));
break;
default:
result.AddTriple(new RDFTriple(obj, RDFVocabulary.RDF.TYPE, RDFVocabulary.RDF.ALT));
break;
}
//Iterate on the container items
if (container.HasChildNodes) {
IEnumerator elems = container.ChildNodes.GetEnumerator();
List<String> elemVals = new List<String>();
while (elems != null && elems.MoveNext()) {
XmlNode elem = (XmlNode)elems.Current;
XmlAttribute elemUri = GetRdfResourceAttribute(elem);
#region Container Resource Item
//This is a container of resources
if (elemUri != null) {
//Sanitize eventual blank node value detected by presence of "nodeID" attribute
if (elemUri.LocalName.Equals("nodeID", StringComparison.Ordinal)) {
if (!elemUri.Value.StartsWith("bnode:")) {
elemUri.Value = "bnode:" + elemUri.Value;
}
}
//obj -> rdf:_N -> VALUE
if (contType == RDFModelEnums.RDFContainerTypes.Alt) {
if (!elemVals.Contains(elemUri.Value)) {
elemVals.Add(elemUri.Value);
result.AddTriple(new RDFTriple(obj, new RDFResource(RDFVocabulary.RDF.BASE_URI + elem.LocalName), new RDFResource(elemUri.Value)));
}
}
else {
result.AddTriple(new RDFTriple(obj, new RDFResource(RDFVocabulary.RDF.BASE_URI + elem.LocalName), new RDFResource(elemUri.Value)));
}
}
#endregion
#region Container Literal Item
//This is a container of literals
else {
//Parse the literal contained in the item
RDFLiteral literal = null;
XmlAttribute attr = GetRdfDatatypeAttribute(elem);
if (attr != null) {
literal = new RDFTypedLiteral(elem.InnerText, RDFModelUtilities.GetDatatypeFromString(attr.InnerText));
}
else {
attr = GetXmlLangAttribute(elem);
literal = new RDFPlainLiteral(elem.InnerText, (attr != null ? attr.InnerText : String.Empty));
}
//obj -> rdf:_N -> VALUE
if (contType == RDFModelEnums.RDFContainerTypes.Alt) {
if (!elemVals.Contains(literal.ToString())) {
elemVals.Add(literal.ToString());
result.AddTriple(new RDFTriple(obj, new RDFResource(RDFVocabulary.RDF.BASE_URI + elem.LocalName), literal));
}
}
else {
result.AddTriple(new RDFTriple(obj, new RDFResource(RDFVocabulary.RDF.BASE_URI + elem.LocalName), literal));
}
}
#endregion
}
}
}
/// <summary>
/// Serializes the given graph to the given stream using XML data format.
/// </summary>
internal static void Serialize(RDFGraph graph, Stream outputStream)
{
try {
#region serialize
using (XmlTextWriter rdfxmlWriter = new XmlTextWriter(outputStream, Encoding.UTF8)) {
XmlDocument rdfDoc = new XmlDocument();
rdfxmlWriter.Formatting = Formatting.Indented;
#region xmlDecl
XmlDeclaration xmlDecl = rdfDoc.CreateXmlDeclaration("1.0", "UTF-8", null);
rdfDoc.AppendChild(xmlDecl);
#endregion
#region rdfRoot
XmlNode rdfRoot = rdfDoc.CreateNode(XmlNodeType.Element, RDFVocabulary.RDF.PREFIX + ":RDF", RDFVocabulary.RDF.BASE_URI);
XmlAttribute rdfRootNS = rdfDoc.CreateAttribute("xmlns:" + RDFVocabulary.RDF.PREFIX);
XmlText rdfRootNSText = rdfDoc.CreateTextNode(RDFVocabulary.RDF.BASE_URI);
rdfRootNS.AppendChild(rdfRootNSText);
rdfRoot.Attributes.Append(rdfRootNS);
#region prefixes
//Write the graph's prefixes (except for "rdf", which has already been written)
graph.GraphMetadata.Namespaces.ForEach(p => {
if (!p.Prefix.Equals(RDFVocabulary.RDF.PREFIX, StringComparison.Ordinal) && !p.Prefix.Equals("base", StringComparison.Ordinal))
{
XmlAttribute pfRootNS = rdfDoc.CreateAttribute("xmlns:" + p.Prefix);
XmlText pfRootNSText = rdfDoc.CreateTextNode(p.ToString());
pfRootNS.AppendChild(pfRootNSText);
rdfRoot.Attributes.Append(pfRootNS);
}
});
//Write the graph's base uri to resolve eventual relative #IDs
XmlAttribute pfBaseNS = rdfDoc.CreateAttribute(RDFVocabulary.XML.PREFIX + ":base");
XmlText pfBaseNSText = rdfDoc.CreateTextNode(graph.Context.ToString());
pfBaseNS.AppendChild(pfBaseNSText);
rdfRoot.Attributes.Append(pfBaseNS);
#endregion
#region linq
//Group the graph's triples by subj
var groupedList = (from triple in graph
orderby triple.Subject.ToString()
group triple by new {
subj = triple.Subject.ToString()
});
#endregion
#region graph
//Iterate over the calculated groups
Dictionary <RDFResource, XmlNode> containers = new Dictionary <RDFResource, XmlNode>();
//Floating containers have reification subject which is never object of any graph's triple
Boolean floatingContainers = graph.GraphMetadata.Containers.Keys.Any(k =>
graph.Triples.Values.Count(v => v.Object.Equals(k)) == 0);
//Floating collections have reification subject which is never object of any graph's triple
Boolean floatingCollections = graph.GraphMetadata.Collections.Keys.Any(k =>
graph.Triples.Values.Count(v => v.Object.Equals(k)) == 0);
foreach (var group in groupedList)
{
#region subj
//Check if the current subj is a container or a collection subj: if so it must be
//serialized in the canonical RDF/XML way instead of the "rdf:Description" way
XmlNode subjNode = null;
String subj = group.Key.subj;
//It is a container subj, so add it to the containers pool
if (graph.GraphMetadata.Containers.Keys.Any(k => k.ToString().Equals(subj, StringComparison.Ordinal)) && !floatingContainers)
{
switch (graph.GraphMetadata.Containers.Single(c => c.Key.ToString().Equals(subj, StringComparison.Ordinal)).Value)
{
case RDFModelEnums.RDFContainerType.Bag:
subjNode = rdfDoc.CreateNode(XmlNodeType.Element, RDFVocabulary.RDF.PREFIX + ":Bag", RDFVocabulary.RDF.BASE_URI);
containers.Add(new RDFResource(subj), subjNode);
break;
case RDFModelEnums.RDFContainerType.Seq:
subjNode = rdfDoc.CreateNode(XmlNodeType.Element, RDFVocabulary.RDF.PREFIX + ":Seq", RDFVocabulary.RDF.BASE_URI);
containers.Add(new RDFResource(subj), subjNode);
break;
case RDFModelEnums.RDFContainerType.Alt:
subjNode = rdfDoc.CreateNode(XmlNodeType.Element, RDFVocabulary.RDF.PREFIX + ":Alt", RDFVocabulary.RDF.BASE_URI);
containers.Add(new RDFResource(subj), subjNode);
break;
}
}
//It is a subj of a collection of resources, so do not append triples having it as a subject
//because we will reconstruct the collection and append it as a whole
else if (graph.GraphMetadata.Collections.Keys.Any(k => k.ToString().Equals(subj, StringComparison.Ordinal)) &&
graph.GraphMetadata.Collections.Single(c => c.Key.ToString().Equals(subj, StringComparison.Ordinal)).Value.ItemType == RDFModelEnums.RDFItemType.Resource &&
!floatingCollections)
{
continue;
}
//It is neither a container or a collection subj
else
{
subjNode = rdfDoc.CreateNode(XmlNodeType.Element, RDFVocabulary.RDF.PREFIX + ":Description", RDFVocabulary.RDF.BASE_URI);
//<rdf:Description rdf:nodeID="blankID">
XmlAttribute subjNodeDesc = null;
XmlText subjNodeDescText = rdfDoc.CreateTextNode(group.Key.subj);
if (group.Key.subj.StartsWith("bnode:"))
{
subjNodeDescText.InnerText = subjNodeDescText.InnerText.Replace("bnode:", String.Empty);
subjNodeDesc = rdfDoc.CreateAttribute(RDFVocabulary.RDF.PREFIX + ":nodeID", RDFVocabulary.RDF.BASE_URI);
}
//<rdf:Description rdf:about="subjURI">
else
{
subjNodeDesc = rdfDoc.CreateAttribute(RDFVocabulary.RDF.PREFIX + ":about", RDFVocabulary.RDF.BASE_URI);
}
subjNodeDesc.AppendChild(subjNodeDescText);
subjNode.Attributes.Append(subjNodeDesc);
}
#endregion
#region predObjList
//Iterate over the triples of the current group
foreach (var triple in group)
{
//Do not append the triple if it is "SUBJECT rdf:type rdf:[Bag|Seq|Alt]"
if (!(triple.Predicate.Equals(RDFVocabulary.RDF.TYPE) &&
(subjNode.Name.Equals(RDFVocabulary.RDF.PREFIX + ":Bag", StringComparison.Ordinal) ||
subjNode.Name.Equals(RDFVocabulary.RDF.PREFIX + ":Seq", StringComparison.Ordinal) ||
subjNode.Name.Equals(RDFVocabulary.RDF.PREFIX + ":Alt", StringComparison.Ordinal))))
{
#region pred
String predString = triple.Predicate.ToString();
//"<predPREF:predURI"
RDFNamespace predNS =
(RDFNamespaceRegister.GetByNamespace(predString) ??
RDFModelUtilities.GenerateNamespace(predString, false));
//Refine the pred with eventually necessary sanitizations
String predUri = predString.Replace(predNS.ToString(), predNS.Prefix + ":")
.Replace(":#", ":")
.TrimEnd(new Char[] { ':', '/' });
//Sanitize eventually detected automatic namespace
if (predUri.StartsWith("autoNS:"))
{
predUri = predUri.Replace("autoNS:", string.Empty);
}
//Do not write "xmlns" attribute if the predUri is the context of the graph
XmlNode predNode = null;
if (predNS.ToString().Equals(graph.Context.ToString(), StringComparison.Ordinal))
{
predNode = rdfDoc.CreateNode(XmlNodeType.Element, predUri, null);
}
else
{
predNode = rdfDoc.CreateNode(XmlNodeType.Element, predUri, predNS.ToString());
}
#endregion
#region object
if (triple.TripleFlavor == RDFModelEnums.RDFTripleFlavor.SPO)
{
//If the object is a container subj, we must append its entire node saved in the containers dictionary
if (containers.Keys.Any(k => k.Equals(triple.Object)) && !floatingContainers)
{
predNode.AppendChild(containers.Single(c => c.Key.Equals(triple.Object)).Value);
}
//Else, if the object is a subject of a collection of resources, we must append the "rdf:parseType=Collection" attribute to the predicate node
else if (graph.GraphMetadata.Collections.Keys.Any(k => k.Equals(triple.Object)) &&
graph.GraphMetadata.Collections.Single(c => c.Key.Equals(triple.Object)).Value.ItemType == RDFModelEnums.RDFItemType.Resource &&
!floatingCollections)
{
XmlAttribute rdfParseType = rdfDoc.CreateAttribute(RDFVocabulary.RDF.PREFIX + ":parseType", RDFVocabulary.RDF.BASE_URI);
XmlText rdfParseTypeText = rdfDoc.CreateTextNode("Collection");
rdfParseType.AppendChild(rdfParseTypeText);
predNode.Attributes.Append(rdfParseType);
//Then we append sequentially the collection elements
List <XmlNode> collElements = ReconstructCollection(graph.GraphMetadata, (RDFResource)triple.Object, rdfDoc);
collElements.ForEach(c => predNode.AppendChild(c));
}
//Else, threat it as a traditional object node
else
{
String objString = triple.Object.ToString();
XmlAttribute predNodeDesc = null;
XmlText predNodeDescText = rdfDoc.CreateTextNode(objString);
// rdf:nodeID="blankID">
if (objString.StartsWith("bnode:"))
{
predNodeDescText.InnerText = predNodeDescText.InnerText.Replace("bnode:", String.Empty);
predNodeDesc = rdfDoc.CreateAttribute(RDFVocabulary.RDF.PREFIX + ":nodeID", RDFVocabulary.RDF.BASE_URI);
}
// rdf:resource="objURI">
else
{
predNodeDesc = rdfDoc.CreateAttribute(RDFVocabulary.RDF.PREFIX + ":resource", RDFVocabulary.RDF.BASE_URI);
}
predNodeDesc.AppendChild(predNodeDescText);
predNode.Attributes.Append(predNodeDesc);
}
}
#endregion
#region literal
else
{
#region plain literal
if (triple.Object is RDFPlainLiteral)
{
RDFPlainLiteral pLit = (RDFPlainLiteral)triple.Object;
// xml:lang="plitLANG">
if (pLit.Language != String.Empty)
{
XmlAttribute plainLiteralLangNodeDesc = rdfDoc.CreateAttribute(RDFVocabulary.XML.PREFIX + ":lang", RDFVocabulary.XML.BASE_URI);
XmlText plainLiteralLangNodeDescText = rdfDoc.CreateTextNode(pLit.Language);
plainLiteralLangNodeDesc.AppendChild(plainLiteralLangNodeDescText);
predNode.Attributes.Append(plainLiteralLangNodeDesc);
}
}
#endregion
#region typed literal
// rdf:datatype="tlitURI">
else
{
RDFTypedLiteral tLit = (RDFTypedLiteral)triple.Object;
XmlAttribute typedLiteralNodeDesc = rdfDoc.CreateAttribute(RDFVocabulary.RDF.PREFIX + ":datatype", RDFVocabulary.RDF.BASE_URI);
XmlText typedLiteralNodeDescText = rdfDoc.CreateTextNode(RDFModelUtilities.GetDatatypeFromEnum(tLit.Datatype));
typedLiteralNodeDesc.AppendChild(typedLiteralNodeDescText);
predNode.Attributes.Append(typedLiteralNodeDesc);
}
#endregion
//litVALUE</predPREF:predURI>"
XmlText litNodeDescText = rdfDoc.CreateTextNode(((RDFLiteral)triple.Object).Value);
predNode.AppendChild(litNodeDescText);
}
#endregion
subjNode.AppendChild(predNode);
}
}
//Raw containers must not be written as-is, instead they have to be saved
//and attached when their subj is found later as object of a triple
if (!subjNode.Name.Equals(RDFVocabulary.RDF.PREFIX + ":Bag", StringComparison.Ordinal) &&
!subjNode.Name.Equals(RDFVocabulary.RDF.PREFIX + ":Seq", StringComparison.Ordinal) &&
!subjNode.Name.Equals(RDFVocabulary.RDF.PREFIX + ":Alt", StringComparison.Ordinal))
{
rdfRoot.AppendChild(subjNode);
}
#endregion
}
#endregion
rdfDoc.AppendChild(rdfRoot);
#endregion
rdfDoc.Save(rdfxmlWriter);
}
#endregion
}
catch (Exception ex) {
throw new RDFModelException("Cannot serialize Xml because: " + ex.Message, ex);
}
}
/// <summary>
/// Given an element representing a RDF container, iterates on its constituent elements
/// to build its standard reification triples.
/// </summary>
internal static void ParseContainerElements(RDFModelEnums.RDFContainerType contType, XmlNode container,
RDFResource subj, RDFResource pred, RDFGraph result)
{
//Attach the container as the blank object of the current pred
RDFResource obj = new RDFResource();
result.AddTriple(new RDFTriple(subj, pred, obj));
//obj -> rdf:type -> rdf:[Bag|Seq|Alt]
switch (contType)
{
case RDFModelEnums.RDFContainerType.Bag:
result.AddTriple(new RDFTriple(obj, RDFVocabulary.RDF.TYPE, RDFVocabulary.RDF.BAG));
break;
case RDFModelEnums.RDFContainerType.Seq:
result.AddTriple(new RDFTriple(obj, RDFVocabulary.RDF.TYPE, RDFVocabulary.RDF.SEQ));
break;
default:
result.AddTriple(new RDFTriple(obj, RDFVocabulary.RDF.TYPE, RDFVocabulary.RDF.ALT));
break;
}
//Iterate on the container items
if (container.HasChildNodes)
{
IEnumerator elems = container.ChildNodes.GetEnumerator();
List <String> elemVals = new List <String>();
while (elems != null && elems.MoveNext())
{
XmlNode elem = (XmlNode)elems.Current;
XmlAttribute elemUri = GetRdfResourceAttribute(elem);
#region Container Resource Item
//This is a container of resources
if (elemUri != null)
{
//Sanitize eventual blank node value detected by presence of "nodeID" attribute
if (elemUri.LocalName.Equals("nodeID", StringComparison.Ordinal))
{
if (!elemUri.Value.StartsWith("bnode:"))
{
elemUri.Value = "bnode:" + elemUri.Value;
}
}
//obj -> rdf:_N -> VALUE
if (contType == RDFModelEnums.RDFContainerType.Alt)
{
if (!elemVals.Contains(elemUri.Value))
{
elemVals.Add(elemUri.Value);
result.AddTriple(new RDFTriple(obj, new RDFResource(RDFVocabulary.RDF.BASE_URI + elem.LocalName), new RDFResource(elemUri.Value)));
}
}
else
{
result.AddTriple(new RDFTriple(obj, new RDFResource(RDFVocabulary.RDF.BASE_URI + elem.LocalName), new RDFResource(elemUri.Value)));
}
}
#endregion
#region Container Literal Item
//This is a container of literals
else
{
//Parse the literal contained in the item
RDFLiteral literal = null;
XmlAttribute attr = GetRdfDatatypeAttribute(elem);
if (attr != null)
{
literal = new RDFTypedLiteral(elem.InnerText, RDFModelUtilities.GetDatatypeFromString(attr.InnerText));
}
else
{
attr = GetXmlLangAttribute(elem);
literal = new RDFPlainLiteral(elem.InnerText, (attr != null ? attr.InnerText : String.Empty));
}
//obj -> rdf:_N -> VALUE
if (contType == RDFModelEnums.RDFContainerType.Alt)
{
if (!elemVals.Contains(literal.ToString()))
{
elemVals.Add(literal.ToString());
result.AddTriple(new RDFTriple(obj, new RDFResource(RDFVocabulary.RDF.BASE_URI + elem.LocalName), literal));
}
}
else
{
result.AddTriple(new RDFTriple(obj, new RDFResource(RDFVocabulary.RDF.BASE_URI + elem.LocalName), literal));
}
}
#endregion
}
}
}
/// <summary>
/// Deserializes the given Xml stream to a graph.
/// </summary>
internal static RDFGraph Deserialize(Stream inputStream)
{
try {
#region deserialize
XmlReaderSettings xrs = new XmlReaderSettings();
xrs.IgnoreComments = true;
xrs.DtdProcessing = DtdProcessing.Ignore;
RDFGraph result = new RDFGraph();
using (XmlReader xr = XmlReader.Create(new StreamReader(inputStream, Encoding.UTF8), xrs)) {
#region load
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(xr);
#endregion
#region root
//Prepare the namespace table for the Xml selections
var nsMgr = new XmlNamespaceManager(new NameTable());
nsMgr.AddNamespace(RDFVocabulary.RDF.PREFIX, RDFVocabulary.RDF.BASE_URI);
//Select "rdf:RDF" root node
XmlNode rdfRDF = GetRdfRootNode(xmlDoc, nsMgr);
#endregion
#region prefixes
//Select "xmlns" attributes and try to add them to the namespace register
var xmlnsAttrs = GetXmlnsNamespaces(rdfRDF, nsMgr);
//Try to get the "xml:base" attribute, which is needed to resolve eventual relative #IDs in "rdf:about" nodes
//If it is not found, set it to the graph Uri
Uri xmlBase = null;
if (xmlnsAttrs != null && xmlnsAttrs.Count > 0)
{
var xmlBaseAttr = (rdfRDF.Attributes["xml:base"] ?? rdfRDF.Attributes["xmlns"]);
if (xmlBaseAttr != null)
{
xmlBase = RDFModelUtilities.GetUriFromString(xmlBaseAttr.Value);
}
}
//Always keep in synch the Context and the xmlBase
if (xmlBase != null)
{
result.SetContext(xmlBase);
}
else
{
xmlBase = result.Context;
}
#endregion
#region elements
//Parse resource elements, which are the childs of root node and represent the subjects
if (rdfRDF.HasChildNodes)
{
var subjNodesEnum = rdfRDF.ChildNodes.GetEnumerator();
while (subjNodesEnum != null && subjNodesEnum.MoveNext())
{
#region subj
//Get the current resource node
XmlNode subjNode = (XmlNode)subjNodesEnum.Current;
RDFResource subj = GetSubjectNode(subjNode, xmlBase, result);
if (subj == null)
{
continue;
}
#endregion
#region predObjList
//Parse pred elements, which are the childs of subj element
if (subjNode.HasChildNodes)
{
IEnumerator predNodesEnum = subjNode.ChildNodes.GetEnumerator();
while (predNodesEnum != null && predNodesEnum.MoveNext())
{
//Get the current pred node
RDFResource pred = null;
XmlNode predNode = (XmlNode)predNodesEnum.Current;
if (predNode.NamespaceURI == String.Empty)
{
pred = new RDFResource(xmlBase + predNode.LocalName);
}
else
{
pred = (predNode.LocalName.StartsWith("autoNS") ?
new RDFResource(predNode.NamespaceURI) :
new RDFResource(predNode.NamespaceURI + predNode.LocalName));
}
#region object
//Check if there is a "rdf:about" or a "rdf:resource" attribute
XmlAttribute rdfObject =
(GetRdfAboutAttribute(predNode) ??
GetRdfResourceAttribute(predNode));
if (rdfObject != null)
{
//Attribute found, but we must check if it is "rdf:ID", "rdf:nodeID" or a relative Uri
String rdfObjectValue = ResolveRelativeNode(rdfObject, xmlBase);
RDFResource obj = new RDFResource(rdfObjectValue);
result.AddTriple(new RDFTriple(subj, pred, obj));
continue;
}
#endregion
#region typed literal
//Check if there is a "rdf:datatype" attribute
XmlAttribute rdfDatatype = GetRdfDatatypeAttribute(predNode);
if (rdfDatatype != null)
{
RDFModelEnums.RDFDatatype dt = RDFModelUtilities.GetDatatypeFromString(rdfDatatype.Value);
RDFTypedLiteral tLit = new RDFTypedLiteral(HttpUtility.HtmlDecode(predNode.InnerText), dt);
result.AddTriple(new RDFTriple(subj, pred, tLit));
continue;
}
//Check if there is a "rdf:parseType=Literal" attribute
XmlAttribute parseLiteral = GetParseTypeLiteralAttribute(predNode);
if (parseLiteral != null)
{
RDFTypedLiteral tLit = new RDFTypedLiteral(HttpUtility.HtmlDecode(predNode.InnerXml), RDFModelEnums.RDFDatatype.RDFS_LITERAL);
result.AddTriple(new RDFTriple(subj, pred, tLit));
continue;
}
#endregion
#region plain literal
//Check if there is a "xml:lang" attribute, or if a unique textual child
XmlAttribute xmlLang = GetXmlLangAttribute(predNode);
if (xmlLang != null || (predNode.HasChildNodes && predNode.ChildNodes.Count == 1 && predNode.ChildNodes[0].NodeType == XmlNodeType.Text))
{
RDFPlainLiteral pLit = new RDFPlainLiteral(HttpUtility.HtmlDecode(predNode.InnerText), (xmlLang != null ? xmlLang.Value : String.Empty));
result.AddTriple(new RDFTriple(subj, pred, pLit));
continue;
}
#endregion
#region collection
//Check if there is a "rdf:parseType=Collection" attribute
XmlAttribute rdfCollect = GetParseTypeCollectionAttribute(predNode);
if (rdfCollect != null)
{
ParseCollectionElements(xmlBase, predNode, subj, pred, result);
continue;
}
#endregion
#region container
//Check if there is a "rdf:[Bag|Seq|Alt]" child node
XmlNode container = GetContainerNode(predNode);
if (container != null)
{
//Distinguish the right type of RDF container to build
if (container.LocalName.Equals(RDFVocabulary.RDF.PREFIX + ":Bag", StringComparison.Ordinal) || container.LocalName.Equals("Bag", StringComparison.Ordinal))
{
ParseContainerElements(RDFModelEnums.RDFContainerType.Bag, container, subj, pred, result);
}
else if (container.LocalName.Equals(RDFVocabulary.RDF.PREFIX + ":Seq", StringComparison.Ordinal) || container.LocalName.Equals("Seq", StringComparison.Ordinal))
{
ParseContainerElements(RDFModelEnums.RDFContainerType.Seq, container, subj, pred, result);
}
else if (container.LocalName.Equals(RDFVocabulary.RDF.PREFIX + ":Alt", StringComparison.Ordinal) || container.LocalName.Equals("Alt", StringComparison.Ordinal))
{
ParseContainerElements(RDFModelEnums.RDFContainerType.Alt, container, subj, pred, result);
}
}
#endregion
}
}
#endregion
}
}
#endregion
}
return(result);
#endregion
}
catch (Exception ex) {
throw new RDFModelException("Cannot deserialize Xml because: " + ex.Message, ex);
}
}
/// <summary>
/// Deserializes the given Xml filepath to a graph.
/// </summary>
internal static RDFGraph Deserialize(String filepath) {
try {
#region deserialize
XmlReaderSettings xrs = new XmlReaderSettings();
xrs.IgnoreComments = true;
xrs.DtdProcessing = DtdProcessing.Ignore;
RDFGraph result = new RDFGraph();
using(XmlReader xr = XmlReader.Create(new StreamReader(filepath, Encoding.UTF8), xrs)) {
#region load
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(xr);
#endregion
#region root
//Prepare the namespace table for the Xml selections
var nsMgr = new XmlNamespaceManager(new NameTable());
nsMgr.AddNamespace(RDFVocabulary.RDF.PREFIX, RDFVocabulary.RDF.BASE_URI);
//Select "rdf:RDF" root node
XmlNode rdfRDF = RDFModelUtilities.GetRdfRootNode(xmlDoc, nsMgr);
#endregion
#region prefixes
//Select "xmlns" attributes and try to add them to the namespace register
var xmlnsAttrs = RDFModelUtilities.GetXmlnsNamespaces(rdfRDF, nsMgr);
//Try to get the "xml:base" attribute, which is needed to resolve eventual relative #IDs in "rdf:about" nodes
//If it is not found, set it to the graph Uri
Uri xmlBase = null;
if (xmlnsAttrs != null && xmlnsAttrs.Count > 0) {
var xmlBaseAttr = (rdfRDF.Attributes["xml:base"] ?? rdfRDF.Attributes["xmlns"]);
if (xmlBaseAttr != null) {
xmlBase = RDFModelUtilities.GetUriFromString(xmlBaseAttr.Value);
}
}
//Always keep in synch the Context and the xmlBase
if (xmlBase != null) {
result.SetContext(xmlBase);
}
else {
xmlBase = result.Context;
}
#endregion
#region elements
//Parse resource elements, which are the childs of root node and represent the subjects
if (rdfRDF.HasChildNodes) {
var subjNodesEnum = rdfRDF.ChildNodes.GetEnumerator();
while (subjNodesEnum != null && subjNodesEnum.MoveNext()) {
#region subj
//Get the current resource node
XmlNode subjNode = (XmlNode)subjNodesEnum.Current;
RDFResource subj = RDFModelUtilities.GetSubjectNode(subjNode, xmlBase, result);
if (subj == null) {
continue;
}
#endregion
#region predObjList
//Parse pred elements, which are the childs of subj element
if (subjNode.HasChildNodes) {
IEnumerator predNodesEnum = subjNode.ChildNodes.GetEnumerator();
while (predNodesEnum != null && predNodesEnum.MoveNext()) {
//Get the current pred node
RDFResource pred = null;
XmlNode predNode = (XmlNode)predNodesEnum.Current;
if (predNode.NamespaceURI == String.Empty) {
pred = new RDFResource(xmlBase + predNode.LocalName);
}
else {
pred = (predNode.LocalName.StartsWith("autoNS") ?
new RDFResource(predNode.NamespaceURI) :
new RDFResource(predNode.NamespaceURI + predNode.LocalName));
}
#region object
//Check if there is a "rdf:about" or a "rdf:resource" attribute
XmlAttribute rdfObject =
(RDFModelUtilities.GetRdfAboutAttribute(predNode) ??
RDFModelUtilities.GetRdfResourceAttribute(predNode));
if (rdfObject != null) {
//Attribute found, but we must check if it is "rdf:ID", "rdf:nodeID" or a relative Uri
String rdfObjectValue = RDFModelUtilities.ResolveRelativeNode(rdfObject, xmlBase);
RDFResource obj = new RDFResource(rdfObjectValue);
result.AddTriple(new RDFTriple(subj, pred, obj));
continue;
}
#endregion
#region typed literal
//Check if there is a "rdf:datatype" attribute
XmlAttribute rdfDatatype = RDFModelUtilities.GetRdfDatatypeAttribute(predNode);
if (rdfDatatype != null) {
RDFDatatype dt = RDFModelUtilities.GetDatatypeFromString(rdfDatatype.Value);
RDFTypedLiteral tLit = new RDFTypedLiteral(HttpUtility.HtmlDecode(predNode.InnerText), dt);
result.AddTriple(new RDFTriple(subj, pred, tLit));
continue;
}
//Check if there is a "rdf:parseType=Literal" attribute
XmlAttribute parseLiteral = RDFModelUtilities.GetParseTypeLiteralAttribute(predNode);
if (parseLiteral != null) {
RDFTypedLiteral tLit = new RDFTypedLiteral(HttpUtility.HtmlDecode(predNode.InnerXml), RDFDatatypeRegister.GetByPrefixAndDatatype(RDFVocabulary.RDFS.PREFIX, "Literal"));
result.AddTriple(new RDFTriple(subj, pred, tLit));
continue;
}
#endregion
#region plain literal
//Check if there is a "xml:lang" attribute, or if a unique textual child
XmlAttribute xmlLang = RDFModelUtilities.GetXmlLangAttribute(predNode);
if (xmlLang != null || (predNode.HasChildNodes && predNode.ChildNodes.Count == 1 && predNode.ChildNodes[0].NodeType == XmlNodeType.Text)) {
RDFPlainLiteral pLit = new RDFPlainLiteral(HttpUtility.HtmlDecode(predNode.InnerText), (xmlLang != null ? xmlLang.Value : String.Empty));
result.AddTriple(new RDFTriple(subj, pred, pLit));
continue;
}
#endregion
#region collection
//Check if there is a "rdf:parseType=Collection" attribute
XmlAttribute rdfCollect = RDFModelUtilities.GetParseTypeCollectionAttribute(predNode);
if (rdfCollect != null) {
RDFModelUtilities.ParseCollectionElements(xmlBase, predNode, subj, pred, result);
continue;
}
#endregion
#region container
//Check if there is a "rdf:[Bag|Seq|Alt]" child node
XmlNode container = RDFModelUtilities.GetContainerNode(predNode);
if (container != null) {
//Distinguish the right type of RDF container to build
if (container.LocalName.Equals(RDFVocabulary.RDF.PREFIX + ":Bag", StringComparison.Ordinal) || container.LocalName.Equals("Bag", StringComparison.Ordinal)) {
RDFModelUtilities.ParseContainerElements(RDFModelEnums.RDFContainerTypes.Bag, container, subj, pred, result);
}
else if (container.LocalName.Equals(RDFVocabulary.RDF.PREFIX + ":Seq", StringComparison.Ordinal) || container.LocalName.Equals("Seq", StringComparison.Ordinal)) {
RDFModelUtilities.ParseContainerElements(RDFModelEnums.RDFContainerTypes.Seq, container, subj, pred, result);
}
else if (container.LocalName.Equals(RDFVocabulary.RDF.PREFIX + ":Alt", StringComparison.Ordinal) || container.LocalName.Equals("Alt", StringComparison.Ordinal)) {
RDFModelUtilities.ParseContainerElements(RDFModelEnums.RDFContainerTypes.Alt, container, subj, pred, result);
}
}
#endregion
}
}
#endregion
}
}
#endregion
}
return result;
#endregion
}
catch (Exception ex) {
throw new RDFModelException("Cannot deserialize Xml because: " + ex.Message, ex);
}
}
/// <summary>
/// Deserializes the given N-Triples stream to a graph.
/// </summary>
internal static RDFGraph Deserialize(Stream inputStream)
{
Int64 ntripleIndex = 0;
try {
#region deserialize
using (StreamReader sr = new StreamReader(inputStream, Encoding.ASCII)) {
RDFGraph result = new RDFGraph();
String ntriple = String.Empty;
String[] tokens = new String[3];
RDFResource S = null;
RDFResource P = null;
RDFResource O = null;
RDFLiteral L = null;
while((ntriple = sr.ReadLine()) != null) {
ntripleIndex++;
#region sanitize & tokenize
//Cleanup previous data
S = null;
tokens[0] = String.Empty;
P = null;
tokens[1] = String.Empty;
O = null;
L = null;
tokens[2] = String.Empty;
//Preliminary sanitizations: clean trailing space-like chars
ntriple = ntriple.Trim(new Char[] { ' ', '\t', '\r', '\n' });
//Skip empty or comment lines
if (ntriple == String.Empty || ntriple.StartsWith("#")) {
continue;
}
//Tokenizes the sanitized triple
tokens = TokenizeNTriple(ntriple);
#endregion
#region subj
String subj = tokens[0].TrimStart(new Char[] { '<' })
.TrimEnd(new Char[] { '>' })
.Replace("_:", "bnode:");
S = new RDFResource(RDFModelUtilities.ASCII_To_Unicode(subj));
#endregion
#region pred
String pred = tokens[1].TrimStart(new Char[] { '<' })
.TrimEnd(new Char[] { '>' });
P = new RDFResource(RDFModelUtilities.ASCII_To_Unicode(pred));
#endregion
#region object
if (tokens[2].StartsWith("<") ||
tokens[2].StartsWith("bnode:") ||
tokens[2].StartsWith("_:")) {
String obj = tokens[2].TrimStart(new Char[] { '<' })
.TrimEnd(new Char[] { '>' })
.Replace("_:", "bnode:")
.Trim(new Char[] { ' ', '\n', '\t', '\r' });
O = new RDFResource(RDFModelUtilities.ASCII_To_Unicode(obj));
}
#endregion
#region literal
else {
#region sanitize
tokens[2] = regexSqt.Replace(tokens[2], String.Empty);
tokens[2] = regexEqt.Replace(tokens[2], String.Empty);
tokens[2] = tokens[2].Replace("\\\\", "\\")
.Replace("\\\"", "\"")
.Replace("\\n", "\n")
.Replace("\\t", "\t")
.Replace("\\r", "\r");
tokens[2] = RDFModelUtilities.ASCII_To_Unicode(tokens[2]);
#endregion
#region plain literal
if (!tokens[2].Contains("^^") ||
tokens[2].EndsWith("^^") ||
tokens[2].Substring(tokens[2].LastIndexOf("^^", StringComparison.Ordinal) + 2, 1) != "<") {
if (regexLPL.Match(tokens[2]).Success) {
tokens[2] = tokens[2].Replace("\"@", "@");
String pLitValue = tokens[2].Substring(0, tokens[2].LastIndexOf("@", StringComparison.Ordinal));
String pLitLang = tokens[2].Substring(tokens[2].LastIndexOf("@", StringComparison.Ordinal) + 1);
L = new RDFPlainLiteral(HttpUtility.HtmlDecode(pLitValue), pLitLang);
}
else {
L = new RDFPlainLiteral(HttpUtility.HtmlDecode(tokens[2]));
}
}
#endregion
#region typed literal
else {
tokens[2] = tokens[2].Replace("\"^^", "^^");
String tLitValue = tokens[2].Substring(0, tokens[2].LastIndexOf("^^", StringComparison.Ordinal));
String tLitDatatype = tokens[2].Substring(tokens[2].LastIndexOf("^^", StringComparison.Ordinal) + 2)
.TrimStart(new Char[] { '<' })
.TrimEnd(new Char[] { '>' });
RDFModelEnums.RDFDatatypes dt = RDFModelUtilities.GetDatatypeFromString(tLitDatatype);
L = new RDFTypedLiteral(HttpUtility.HtmlDecode(tLitValue), dt);
}
#endregion
}
#endregion
#region addtriple
if (O != null) {
result.AddTriple(new RDFTriple(S, P, O));
}
else {
result.AddTriple(new RDFTriple(S, P, L));
}
#endregion
}
return result;
}
#endregion
}
catch(Exception ex) {
throw new RDFModelException("Cannot deserialize N-Triples (line " + ntripleIndex + ") because: " + ex.Message, ex);
}
}
/// <summary>
/// Deserializes the given N-Quads stream to a memory store.
/// </summary>
internal static RDFMemoryStore Deserialize(Stream inputStream) {
Int64 nquadIndex = 0;
try {
#region deserialize
using (StreamReader sr = new StreamReader(inputStream, Encoding.ASCII)) {
RDFMemoryStore result = new RDFMemoryStore();
String nquad = String.Empty;
String[] tokens = new String[4];
RDFResource S = null;
RDFResource P = null;
RDFResource O = null;
RDFLiteral L = null;
RDFContext C = new RDFContext();
while((nquad = sr.ReadLine()) != null) {
nquadIndex++;
#region sanitize & tokenize
//Cleanup previous data
S = null;
tokens[0] = String.Empty;
P = null;
tokens[1] = String.Empty;
O = null;
L = null;
tokens[2] = String.Empty;
C = new RDFContext();
tokens[3] = String.Empty;
//Preliminary sanitizations: clean trailing space-like chars
nquad = nquad.Trim(new Char[] { ' ', '\t', '\r', '\n' });
//Skip empty or comment lines
if (nquad == String.Empty || nquad.StartsWith("#")) {
continue;
}
//Tokenizes the sanitized quad
tokens = TokenizeNQuad(nquad);
#endregion
#region subj
String subj = tokens[0].TrimStart(new Char[] { '<' })
.TrimEnd(new Char[] { '>' })
.Replace("_:", "bnode:");
S = new RDFResource(RDFModelUtilities.ASCII_To_Unicode(subj));
#endregion
#region pred
String pred = tokens[1].TrimStart(new Char[] { '<' })
.TrimEnd(new Char[] { '>' });
P = new RDFResource(RDFModelUtilities.ASCII_To_Unicode(pred));
#endregion
#region object
if (tokens[2].StartsWith("<") ||
tokens[2].StartsWith("bnode:") ||
tokens[2].StartsWith("_:")) {
String obj = tokens[2].TrimStart(new Char[] { '<' })
.TrimEnd(new Char[] { '>' })
.Replace("_:", "bnode:")
.Trim(new Char[] { ' ', '\n', '\t', '\r' });
O = new RDFResource(RDFModelUtilities.ASCII_To_Unicode(obj));
}
#endregion
#region literal
else {
#region sanitize
tokens[2] = RDFNTriples.regexSqt.Replace(tokens[2], String.Empty);
tokens[2] = RDFNTriples.regexEqt.Replace(tokens[2], String.Empty);
tokens[2] = tokens[2].Replace("\\\\", "\\")
.Replace("\\\"", "\"")
.Replace("\\n", "\n")
.Replace("\\t", "\t")
.Replace("\\r", "\r");
tokens[2] = RDFModelUtilities.ASCII_To_Unicode(tokens[2]);
#endregion
#region plain literal
if (!tokens[2].Contains("^^") ||
tokens[2].EndsWith("^^") ||
tokens[2].Substring(tokens[2].LastIndexOf("^^", StringComparison.Ordinal) + 2, 1) != "<") {
if (RDFNTriples.regexLPL.Match(tokens[2]).Success) {
tokens[2] = tokens[2].Replace("\"@", "@");
String pLitValue = tokens[2].Substring(0, tokens[2].LastIndexOf("@", StringComparison.Ordinal));
String pLitLang = tokens[2].Substring(tokens[2].LastIndexOf("@", StringComparison.Ordinal) + 1);
L = new RDFPlainLiteral(HttpUtility.HtmlDecode(pLitValue), pLitLang);
}
else {
L = new RDFPlainLiteral(HttpUtility.HtmlDecode(tokens[2]));
}
}
#endregion
#region typed literal
else {
tokens[2] = tokens[2].Replace("\"^^", "^^");
String tLitValue = tokens[2].Substring(0, tokens[2].LastIndexOf("^^", StringComparison.Ordinal));
String tLitDatatype = tokens[2].Substring(tokens[2].LastIndexOf("^^", StringComparison.Ordinal) + 2)
.TrimStart(new Char[] { '<' })
.TrimEnd(new Char[] { '>' });
RDFModelEnums.RDFDatatypes dt = RDFModelUtilities.GetDatatypeFromString(tLitDatatype);
L = new RDFTypedLiteral(HttpUtility.HtmlDecode(tLitValue), dt);
}
#endregion
}
#endregion
#region context
if (!String.IsNullOrEmpty(tokens[3])) {
String ctx = tokens[3].TrimStart(new Char[] { '<' })
.TrimEnd(new Char[] { '>' });
Uri ctxUri = null;
if (Uri.TryCreate(ctx, UriKind.Absolute, out ctxUri)) {
C = new RDFContext(RDFModelUtilities.ASCII_To_Unicode(ctxUri.ToString()));
}
else {
throw new RDFModelException("found context '" + ctx +"' which is not a well-formed absolute Uri");
}
}
#endregion
#region addquadruple
if (O != null) {
result.AddQuadruple(new RDFQuadruple(C, S, P, O));
}
else {
result.AddQuadruple(new RDFQuadruple(C, S, P, L));
}
#endregion
}
return result;
}
#endregion
}
catch(Exception ex) {
throw new RDFModelException("Cannot deserialize N-Quads (line " + nquadIndex + ") because: " + ex.Message, ex);
}
}
/// <summary>
/// Serializes the given graph to the given stream using XML data format.
/// </summary>
internal static void Serialize(RDFGraph graph, Stream outputStream)
{
try {
#region serialize
using (XmlTextWriter rdfxmlWriter = new XmlTextWriter(outputStream, Encoding.UTF8)) {
XmlDocument rdfDoc = new XmlDocument();
rdfxmlWriter.Formatting = Formatting.Indented;
#region xmlDecl
XmlDeclaration xmlDecl = rdfDoc.CreateXmlDeclaration("1.0", "UTF-8", null);
rdfDoc.AppendChild(xmlDecl);
#endregion
#region rdfRoot
XmlNode rdfRoot = rdfDoc.CreateNode(XmlNodeType.Element, RDFVocabulary.RDF.PREFIX + ":RDF", RDFVocabulary.RDF.BASE_URI);
XmlAttribute rdfRootNS = rdfDoc.CreateAttribute("xmlns:" + RDFVocabulary.RDF.PREFIX);
XmlText rdfRootNSText = rdfDoc.CreateTextNode(RDFVocabulary.RDF.BASE_URI);
rdfRootNS.AppendChild(rdfRootNSText);
rdfRoot.Attributes.Append(rdfRootNS);
#region prefixes
//Write the prefixes (except for "rdf" and "base")
var graphNamespaces = RDFModelUtilities.GetGraphNamespaces(graph);
var autoNamespaces = GetAutomaticNamespaces(graph);
graphNamespaces.Union(autoNamespaces).ToList().ForEach(p => {
if(!p.NamespacePrefix.Equals(RDFVocabulary.RDF.PREFIX, StringComparison.Ordinal) && !p.NamespacePrefix.Equals("base", StringComparison.Ordinal)) {
XmlAttribute pfRootNS = rdfDoc.CreateAttribute("xmlns:" + p.NamespacePrefix);
XmlText pfRootNSText = rdfDoc.CreateTextNode(p.ToString());
pfRootNS.AppendChild(pfRootNSText);
rdfRoot.Attributes.Append(pfRootNS);
}
});
//Write the graph's base uri to resolve eventual relative #IDs
XmlAttribute pfBaseNS = rdfDoc.CreateAttribute(RDFVocabulary.XML.PREFIX + ":base");
XmlText pfBaseNSText = rdfDoc.CreateTextNode(graph.Context.ToString());
pfBaseNS.AppendChild(pfBaseNSText);
rdfRoot.Attributes.Append(pfBaseNS);
#endregion
#region linq
//Group the graph's triples by subj
var groupedList = (from triple in graph
orderby triple.Subject.ToString()
group triple by new {
subj = triple.Subject.ToString()
});
#endregion
#region graph
//Iterate over the calculated groups
Dictionary<RDFResource, XmlNode> containers = new Dictionary<RDFResource, XmlNode>();
//Floating containers have reification subject which is never object of any graph's triple
Boolean floatingContainers = graph.GraphMetadata.Containers.Keys.Any(k =>
graph.Triples.Values.Count(v => v.Object.Equals(k)) == 0);
//Floating collections have reification subject which is never object of any graph's triple
Boolean floatingCollections = graph.GraphMetadata.Collections.Keys.Any(k =>
graph.Triples.Values.Count(v => v.Object.Equals(k)) == 0);
foreach (var group in groupedList) {
#region subj
//Check if the current subj is a container or a collection subj: if so it must be
//serialized in the canonical RDF/XML way instead of the "rdf:Description" way
XmlNode subjNode = null;
String subj = group.Key.subj;
//It is a container subj, so add it to the containers pool
if (graph.GraphMetadata.Containers.Keys.Any(k => k.ToString().Equals(subj, StringComparison.Ordinal)) && !floatingContainers) {
switch (graph.GraphMetadata.Containers.Single(c => c.Key.ToString().Equals(subj, StringComparison.Ordinal)).Value) {
case RDFModelEnums.RDFContainerTypes.Bag:
subjNode = rdfDoc.CreateNode(XmlNodeType.Element, RDFVocabulary.RDF.PREFIX + ":Bag", RDFVocabulary.RDF.BASE_URI);
containers.Add(new RDFResource(subj), subjNode);
break;
case RDFModelEnums.RDFContainerTypes.Seq:
subjNode = rdfDoc.CreateNode(XmlNodeType.Element, RDFVocabulary.RDF.PREFIX + ":Seq", RDFVocabulary.RDF.BASE_URI);
containers.Add(new RDFResource(subj), subjNode);
break;
case RDFModelEnums.RDFContainerTypes.Alt:
subjNode = rdfDoc.CreateNode(XmlNodeType.Element, RDFVocabulary.RDF.PREFIX + ":Alt", RDFVocabulary.RDF.BASE_URI);
containers.Add(new RDFResource(subj), subjNode);
break;
}
}
//It is a subj of a collection of resources, so do not append triples having it as a subject
//because we will reconstruct the collection and append it as a whole
else if (graph.GraphMetadata.Collections.Keys.Any(k => k.ToString().Equals(subj, StringComparison.Ordinal)) &&
graph.GraphMetadata.Collections.Single(c => c.Key.ToString().Equals(subj, StringComparison.Ordinal)).Value.ItemType == RDFModelEnums.RDFItemTypes.Resource &&
!floatingCollections) {
continue;
}
//It is neither a container or a collection subj
else {
subjNode = rdfDoc.CreateNode(XmlNodeType.Element, RDFVocabulary.RDF.PREFIX + ":Description", RDFVocabulary.RDF.BASE_URI);
//<rdf:Description rdf:nodeID="blankID">
XmlAttribute subjNodeDesc = null;
XmlText subjNodeDescText = rdfDoc.CreateTextNode(group.Key.subj);
if (group.Key.subj.StartsWith("bnode:")) {
subjNodeDesc = rdfDoc.CreateAttribute(RDFVocabulary.RDF.PREFIX + ":nodeID", RDFVocabulary.RDF.BASE_URI);
}
//<rdf:Description rdf:about="subjURI">
else {
subjNodeDesc = rdfDoc.CreateAttribute(RDFVocabulary.RDF.PREFIX + ":about", RDFVocabulary.RDF.BASE_URI);
}
subjNodeDesc.AppendChild(subjNodeDescText);
subjNode.Attributes.Append(subjNodeDesc);
}
#endregion
#region predObjList
//Iterate over the triples of the current group
foreach (var triple in group) {
//Do not append the triple if it is "SUBJECT rdf:type rdf:[Bag|Seq|Alt]"
if (!(triple.Predicate.Equals(RDFVocabulary.RDF.TYPE) &&
(subjNode.Name.Equals(RDFVocabulary.RDF.PREFIX + ":Bag", StringComparison.Ordinal) ||
subjNode.Name.Equals(RDFVocabulary.RDF.PREFIX + ":Seq", StringComparison.Ordinal) ||
subjNode.Name.Equals(RDFVocabulary.RDF.PREFIX + ":Alt", StringComparison.Ordinal)))) {
#region pred
String predString = triple.Predicate.ToString();
//"<predPREF:predURI"
RDFNamespace predNS = RDFNamespaceRegister.GetByUri(predString) ?? GenerateNamespace(predString, false);
String predUri = (predNS.NamespacePrefix.Equals("autoNS", StringComparison.OrdinalIgnoreCase) ?
predString.Replace(predNS.ToString(), autoNamespaces.Find(ns => ns.NamespaceUri.Equals(predNS.NamespaceUri)).NamespacePrefix + ":") :
predString.Replace(predNS.ToString(), predNS.NamespacePrefix + ":"))
.Replace(":#", ":")
.TrimEnd(new Char[] { ':', '/' });
try {
var predUriQName = new RDFTypedLiteral(predUri, RDFModelEnums.RDFDatatypes.XSD_QNAME);
}
catch {
throw new RDFModelException(String.Format("found '{0}' predicate which cannot be abbreviated to a valid QName", predUri));
}
XmlNode predNode = rdfDoc.CreateNode(XmlNodeType.Element, predUri, predNS.ToString());
#endregion
#region object
if (triple.TripleFlavor == RDFModelEnums.RDFTripleFlavors.SPO) {
//If the object is a container subj, we must append its entire node saved in the containers dictionary
if (containers.Keys.Any(k => k.Equals(triple.Object)) && !floatingContainers) {
predNode.AppendChild(containers.Single(c => c.Key.Equals(triple.Object)).Value);
}
//Else, if the object is a subject of a collection of resources, we must append the "rdf:parseType=Collection" attribute to the predicate node
else if (graph.GraphMetadata.Collections.Keys.Any(k => k.Equals(triple.Object)) &&
graph.GraphMetadata.Collections.Single(c => c.Key.Equals(triple.Object)).Value.ItemType == RDFModelEnums.RDFItemTypes.Resource &&
!floatingCollections) {
XmlAttribute rdfParseType = rdfDoc.CreateAttribute(RDFVocabulary.RDF.PREFIX + ":parseType", RDFVocabulary.RDF.BASE_URI);
XmlText rdfParseTypeText = rdfDoc.CreateTextNode("Collection");
rdfParseType.AppendChild(rdfParseTypeText);
predNode.Attributes.Append(rdfParseType);
//Then we append sequentially the collection elements
List<XmlNode> collElements = ReconstructCollection(graph.GraphMetadata, (RDFResource)triple.Object, rdfDoc);
collElements.ForEach(c => predNode.AppendChild(c));
}
//Else, threat it as a traditional object node
else {
String objString = triple.Object.ToString();
XmlAttribute predNodeDesc = null;
XmlText predNodeDescText = rdfDoc.CreateTextNode(objString);
// rdf:nodeID="blankID">
if (objString.StartsWith("bnode:")) {
predNodeDesc = rdfDoc.CreateAttribute(RDFVocabulary.RDF.PREFIX + ":nodeID", RDFVocabulary.RDF.BASE_URI);
}
// rdf:resource="objURI">
else {
predNodeDesc = rdfDoc.CreateAttribute(RDFVocabulary.RDF.PREFIX + ":resource", RDFVocabulary.RDF.BASE_URI);
}
predNodeDesc.AppendChild(predNodeDescText);
predNode.Attributes.Append(predNodeDesc);
}
}
#endregion
#region literal
else {
#region plain literal
if (triple.Object is RDFPlainLiteral) {
RDFPlainLiteral pLit = (RDFPlainLiteral)triple.Object;
// xml:lang="plitLANG">
if (pLit.Language != String.Empty) {
XmlAttribute plainLiteralLangNodeDesc = rdfDoc.CreateAttribute(RDFVocabulary.XML.PREFIX + ":lang", RDFVocabulary.XML.BASE_URI);
XmlText plainLiteralLangNodeDescText = rdfDoc.CreateTextNode(pLit.Language);
plainLiteralLangNodeDesc.AppendChild(plainLiteralLangNodeDescText);
predNode.Attributes.Append(plainLiteralLangNodeDesc);
}
}
#endregion
#region typed literal
// rdf:datatype="tlitURI">
else {
RDFTypedLiteral tLit = (RDFTypedLiteral)triple.Object;
XmlAttribute typedLiteralNodeDesc = rdfDoc.CreateAttribute(RDFVocabulary.RDF.PREFIX + ":datatype", RDFVocabulary.RDF.BASE_URI);
XmlText typedLiteralNodeDescText = rdfDoc.CreateTextNode(RDFModelUtilities.GetDatatypeFromEnum(tLit.Datatype));
typedLiteralNodeDesc.AppendChild(typedLiteralNodeDescText);
predNode.Attributes.Append(typedLiteralNodeDesc);
}
#endregion
//litVALUE</predPREF:predURI>"
XmlText litNodeDescText = rdfDoc.CreateTextNode(RDFModelUtilities.EscapeControlCharsForXML(HttpUtility.HtmlDecode(((RDFLiteral)triple.Object).Value)));
predNode.AppendChild(litNodeDescText);
}
#endregion
subjNode.AppendChild(predNode);
}
}
//Raw containers must not be written as-is, instead they have to be saved
//and attached when their subj is found later as object of a triple
if (!subjNode.Name.Equals(RDFVocabulary.RDF.PREFIX + ":Bag", StringComparison.Ordinal) &&
!subjNode.Name.Equals(RDFVocabulary.RDF.PREFIX + ":Seq", StringComparison.Ordinal) &&
!subjNode.Name.Equals(RDFVocabulary.RDF.PREFIX + ":Alt", StringComparison.Ordinal)) {
rdfRoot.AppendChild(subjNode);
}
#endregion
}
#endregion
rdfDoc.AppendChild(rdfRoot);
#endregion
rdfDoc.Save(rdfxmlWriter);
}
#endregion
}
catch (Exception ex) {
throw new RDFModelException("Cannot serialize RDF/Xml because: " + ex.Message, ex);
}
}