private void WorkingWithRdfModels()
{
// CREATE RESOURCE
var donaldduck = new RDFResource("http://www.waltdisney.com/donald_duck");
// CREATE BLANK RESOURCE
var disney_group = new RDFResource();
// CREATE PLAIN LITERAL
// "Donald Duck"
var donaldduck_name = new RDFPlainLiteral("Donald Duck");
// CREATE PLAIN LITERAL WITH LANGUAGE TAG
// "Donald Duck"@en-US
var donaldduck_name_enusLiteral = new RDFPlainLiteral("Donald Duck", "en-US");
// CREATE TYPED LITERAL
// "85"^^xsd:integer
var mickeymouse_age = new RDFTypedLiteral("85", RDFModelEnums.RDFDatatypes.XSD_INTEGER);
// CREATE TRIPLES
// "Mickey Mouse is 85 years old"
RDFTriple mickeymouse_is85yr
= new RDFTriple(
new RDFResource("http://www.waltdisney.com/mickey_mouse"),
new RDFResource("http://xmlns.com/foaf/0.1/age"),
new RDFTypedLiteral("85", RDFModelEnums.RDFDatatypes.XSD_INTEGER));
// "Donald Duck has english (US) name "Donald Duck""
RDFTriple donaldduck_name_enus = new RDFTriple(
new RDFResource("http://www.waltdisney.com/donald_duck"),
new RDFResource("http://xmlns.com/foaf/0.1/name"),
new RDFPlainLiteral("Donald Duck", "en-US"));
// CREATE EMPTY GRAPH
var another_graph = new RDFGraph();
var waltdisney_filled = new RDFGraph();
// CREATE GRAPH FROM A LIST OF TRIPLES
var triples = new List <RDFTriple> {
mickeymouse_is85yr, donaldduck_name_enus
};
var waltdisney = new RDFGraph(triples);
// SET CONTEXT OF A GRAPH
waltdisney.SetContext(new Uri("http://waltdisney.com/"));
// GET A DATATABLE FROM A GRAPH
var waltdisney_table = waltdisney.ToDataTable();
// GET A GRAPH FROM A DATATABLE
var waltdisney_newgraph = RDFGraph.FromDataTable(waltdisney_table);
// ITERATE TRIPLES OF A GRAPH WITH FOREACH
foreach (var t in waltdisney)
{
Console.WriteLine("Triple: " + t);
Console.WriteLine(" Subject: " + t.Subject);
Console.WriteLine(" Predicate: " + t.Predicate);
Console.WriteLine(" Object: " + t.Object);
}
// ITERATE TRIPLES OF A GRAPH WITH ENUMERATOR
var triplesEnum = waltdisney.TriplesEnumerator;
while (triplesEnum.MoveNext())
{
Console.WriteLine("Triple: " + triplesEnum.Current);
Console.WriteLine(" Subject: " + triplesEnum.Current.Subject);
Console.WriteLine(" Predicate: " + triplesEnum.Current.Predicate);
Console.WriteLine(" Object: " + triplesEnum.Current.Object);
}
// GET COUNT OF TRIPLES CONTAINED IN A GRAPH
var triplesCount = waltdisney.TriplesCount;
// MULTIPLE SELECTIONS
var multiple_selections_graph =
waltdisney.SelectTriplesBySubject(new RDFResource("http://www.waltdisney.com/donald_duck"))
.SelectTriplesByPredicate(new RDFResource("http://xmlns.com/foaf/0.1/name"));
// SET OPERATIONS
var set_operations_graph = waltdisney.IntersectWith(waltdisney_filled).UnionWith(another_graph);
/*
* var ntriplesFormat = RDFModelEnums.RDFFormats.NTriples;
* // READ N-TRIPLES FILE
* var graph = RDFGraph.FromFile(ntriplesFormat, "C:\\file.nt");
* // READ N-TRIPLES STREAM
* var graph = RDFGraph.FromStream(ntriplesFormat, inStream);
* // WRITE N-TRIPLES FILE
* graph.ToFile(ntriplesFormat, "C:\\newfile.nt");
* // WRITE N-TRIPLES STREAM
* graph.ToStream(ntriplesFormat, outStream);
*/
/*
* var turtleFormat = RDFModelEnums.RDFFormats.Turtle;
* // READ TURTLE FILE
* var graph = RDFGraph.FromFile(turtleFormat, "C:\\file.ttl");
* // READ TURTLE STREAM
* var graph = RDFGraph.FromStream(turtleFormat, inStream);
* // WRITE TURTLE FILE
* graph.ToFile(turtleFormat, "C:\\newfile.ttl");
* // WRITE TURTLE STREAM
* graph.ToStream(turtleFormat, outStream);
*/
/*
* var xmlFormat = RDFModelEnums.RDFFormats.RdfXml;
* // READ RDF/XML FILE
* var graph = RDFGraph.FromFile(xmlFormat, "C:\\file.rdf");
* // READ RDF/XML STREAM
* var graph = RDFGraph.FromStream(xmlFormat, inStream);
* // WRITE RDF/XML FILE
* graph.ToFile(xmlFormat, "C:\\newfile.rdf");
* // WRITE RDF/XML STREAM
* graph.ToStream(xmlFormat, outStream);
*/
// CREATE NAMESPACE
var waltdisney_ns = new RDFNamespace("wd", "http://www.waltdisney.com/");
// USE NAMESPACE IN RESOURCE CREATION
var duckburg = new RDFResource(waltdisney_ns + "duckburg");
var mouseton = new RDFResource(waltdisney_ns + "mouseton");
RDFNamespaceRegister.AddNamespace(waltdisney_ns);
// Retrieves a namespace by seeking presence of its prefix (null if not found). Supports prefix.cc
var ns1 = RDFNamespaceRegister.GetByPrefix("dbpedia", false); //local search
var ns2 = RDFNamespaceRegister.GetByPrefix("dbpedia", true); //search prefix.cc service if no result
// GET DEFAULT NAMESPACE
var nSpace = RDFNamespaceRegister.DefaultNamespace;
// SET DEFAULT NAMESPACE
RDFNamespaceRegister.SetDefaultNamespace(waltdisney_ns); //new graphs will default to this context
// ITERATE NAMESPACES OF REGISTER WITH FOREACH
foreach (var ns in RDFNamespaceRegister.Instance)
{
Console.WriteLine("Prefix: " + ns.NamespacePrefix);
Console.WriteLine("Namespace: " + ns.NamespaceUri);
}
// ITERATE NAMESPACES OF REGISTER WITH ENUMERATOR
var nspacesEnum = RDFNamespaceRegister.NamespacesEnumerator;
while (nspacesEnum.MoveNext())
{
Console.WriteLine("Prefix: " + nspacesEnum.Current.NamespacePrefix);
Console.WriteLine("Namespace: " + nspacesEnum.Current.NamespaceUri);
}
// CREATE TRIPLES WITH VOCABULARY FACILITIES
// "Goofy Goof is 82 years old"
RDFTriple goofygoof_is82yr = new RDFTriple(
new RDFResource(new Uri("http://www.waltdisney.com/goofy_goof").ToString()),
RDFVocabulary.FOAF.AGE,
new RDFPlainLiteral("82")
);
// "Donald Duck knows Goofy Goof"
RDFTriple donaldduck_knows_goofygoof = new RDFTriple(
new RDFResource(new Uri("http://www.waltdisney.com/donald_duck").ToString()),
RDFVocabulary.FOAF.KNOWS,
new RDFResource(new Uri("http://www.waltdisney.com/goofy_goof").ToString())
);
// CREATE TYPED LITERALS
var myAge = new RDFTypedLiteral("34", RDFModelEnums.RDFDatatypes.XSD_INT);
var myDate = new RDFTypedLiteral("2017-01-07", RDFModelEnums.RDFDatatypes.XSD_DATE);
var myDateTime = new RDFTypedLiteral("2017-01-07T23:11:05", RDFModelEnums.RDFDatatypes.XSD_DATETIME);
var myXml = new RDFTypedLiteral("<book>title</book>", RDFModelEnums.RDFDatatypes.RDF_XMLLITERAL);
var myLiteral = new RDFTypedLiteral("generic literal", RDFModelEnums.RDFDatatypes.RDFS_LITERAL);
/*
* The given list of items may be incomplete.
* A container is semantically opened to the possibility of having further elements
*
* Alt: unordered semantic, duplicates not allowed;
* Bag: unordered semantic, duplicates allowed;
* Seq: ordered semantic, duplicates allowed;
*/
// CREATE CONTAINER AND ADD ITEMS
RDFContainer beatles_cont = new RDFContainer(RDFModelEnums.RDFContainerTypes.Bag, RDFModelEnums.RDFItemTypes.Resource);
beatles_cont.AddItem(new RDFResource("http://beatles.com/ringo_starr"));
beatles_cont.AddItem(new RDFResource("http://beatles.com/john_lennon"));
beatles_cont.AddItem(new RDFResource("http://beatles.com/paul_mc_cartney"));
beatles_cont.AddItem(new RDFResource("http://beatles.com/george_harrison"));
/*
* The given list of items may not be incomplete.
* A collection is semantically closed to the possibility of having further elements
*/
// CREATE COLLECTION AND ADD ITEMS
RDFCollection beatles_coll = new RDFCollection(RDFModelEnums.RDFItemTypes.Resource);
beatles_coll.AddItem(new RDFResource("http://beatles.com/ringo_starr"));
beatles_coll.AddItem(new RDFResource("http://beatles.com/john_lennon"));
beatles_coll.AddItem(new RDFResource("http://beatles.com/paul_mc_cartney"));
beatles_coll.AddItem(new RDFResource("http://beatles.com/george_harrison"));
// ADD CONTAINER/COLLECTION TO GRAPH
waltdisney.AddContainer(beatles_cont);
waltdisney.AddCollection(beatles_coll);
// REIFY TRIPLE AND MERGE IT INTO A GRAPH
RDFGraph reifGraph = goofygoof_is82yr.ReifyTriple();
waltdisney = waltdisney.UnionWith(reifGraph);
// ASSERT SOMETHING ABOUT REIFIED TRIPLE
waltdisney.AddTriple(new RDFTriple(
new RDFResource("http://www.wikipedia.com/"),
new RDFResource("http://example.org/verb_state"),
goofygoof_is82yr.ReificationSubject
));
var existingGraph = new RDFGraph();
// REIFY CONTAINER
existingGraph.AddContainer(beatles_cont);
existingGraph.AddTriple(new RDFTriple(
new RDFResource("http://www.thebeatles.com/"),
RDFVocabulary.FOAF.GROUP,
beatles_cont.ReificationSubject
));
// REIFY COLLECTION
existingGraph.AddCollection(beatles_coll);
existingGraph.AddTriple(new RDFTriple(
new RDFResource("http://www.thebeatles.com/"),
RDFVocabulary.FOAF.GROUP,
beatles_coll.ReificationSubject
));
// WORKING WITH RDF STORES
// CREATE CONTEXT FROM STRING
var wdisney_ctx = new RDFContext("http://www.waltdisney.com/");
// CREATE CONTEXT FROM URI
var wdisney_ctx_uri = new RDFContext(new Uri("http://www.waltdisney.com/"));
// CREATE DEFAULT CONTEXT (DEFAULT NAMESPACE)
var wdisney_ctx_default = new RDFContext();
// CREATE QUADRUPLES
// "From Wikipedia.com: Mickey Mouse is 85 years old"
RDFQuadruple wk_mickeymouse_is85yr = new RDFQuadruple(
new RDFContext("http://www.wikipedia.com/"),
new RDFResource("http://www.waltdisney.com/mickey_mouse"),
RDFVocabulary.FOAF.AGE,
new RDFTypedLiteral("85", RDFModelEnums.RDFDatatypes.XSD_INTEGER)
);
// "From WaltDisney.com: Mickey Mouse is 85 years old"
RDFQuadruple wd_mickeymouse_is85yr = new RDFQuadruple(
new RDFContext("http://www.waltdisney.com/"),
new RDFResource("http://www.waltdisney.com/mickey_mouse"),
RDFVocabulary.FOAF.AGE,
new RDFTypedLiteral("85", RDFModelEnums.RDFDatatypes.XSD_INTEGER)
);
// "From Wikipedia.com: Donald Duck has english name "Donald Duck""
RDFQuadruple wk_donald_duck_name_enus = new RDFQuadruple(
new RDFContext("http://www.wikipedia.com/"),
new RDFResource("http://www.waltdisney.com/donald_duck"),
RDFVocabulary.FOAF.NAME,
new RDFPlainLiteral("Donald Duck", "en")
);
// CREATE EMPTY MEMORY STORE
var wdStore = new RDFMemoryStore();
// CREATE MEMORY STORE FROM A LIST OF QUADRUPLES
var quadruples = new List <RDFQuadruple> {
wk_mickeymouse_is85yr, wk_mickeymouse_is85yr
};
var wdStoreFilled = new RDFMemoryStore();
foreach (var q in quadruples)
{
wdStoreFilled.AddQuadruple(q);
}
// GET A DATATABLE FROM A MEMORY STORE (any kind of store can be exported to datatable)
var wdStore_table = wdStoreFilled.ToDataTable();
// GET A MEMORY STORE FROM A DATATABLE
var wdStore_new = RDFMemoryStore.FromDataTable(wdStore_table);
// ITERATE QUADRUPLES OF A MEMORY STORE WITH FOREACH
foreach (var q in wdStore)
{
Console.WriteLine("Quadruple: " + q);
Console.WriteLine(" Context: " + q.Context);
Console.WriteLine(" Subject: " + q.Subject);
Console.WriteLine(" Predicate: " + q.Predicate);
Console.WriteLine(" Object: " + q.Object);
}
// ITERATE QUADRUPLES OF A MEMORY STORE WITH ENUMERATOR
var quadruplesEnum = wdStore.QuadruplesEnumerator;
while (quadruplesEnum.MoveNext())
{
Console.WriteLine("Quadruple: " + quadruplesEnum.Current);
Console.WriteLine(" Context: " + quadruplesEnum.Current.Context);
Console.WriteLine(" Subject: " + quadruplesEnum.Current.Subject);
Console.WriteLine(" Predicate: " + quadruplesEnum.Current.Predicate);
Console.WriteLine(" Object: " + quadruplesEnum.Current.Object);
}
var nquadsFormat = RDFStoreEnums.RDFFormats.NQuads;
// READ N-QUADS FILE
//var myStore = RDFMemoryStore.FromFile(nquadsFormat, "C:\\file.nq");
// READ N-QUADS STREAM
//var myStore = RDFMemoryStore.FromStream(nquadsFormat, inStream);
// WRITE N-QUADS FILE
wdStoreFilled.ToFile(nquadsFormat, @"C:\TEMP\newfile.nq");
// WRITE N-QUADS STREAM
//myStore.ToStream(nquadsFormat, outStream);
var trixFormat = RDFStoreEnums.RDFFormats.TriX;
// READ TRIX FILE
//var memStore = RDFMemoryStore.FromFile(trixFormat, "C:\\file.trix");
// READ TRIX STREAM
//var memStore = RDFMemoryStore.FromStream(trixFormat, inStream);
// WRITE TRIX FILE
wdStoreFilled.ToFile(trixFormat, @"C:\TEMP\newfile.trix");
// WRITE TRIX STREAM
//myStore.ToStream(trixFormat, outStream);
// CONNECT TO SQLSERVER STORE WITH CONNECTION STRING
//var sqlServer = new RDFSQLServerStore(sqlServerConnectionString);
// CREATE EMPTY FEDERATION
var fed = new RDFFederation();
/*
* // CREATE FEDERATION FROM A LIST OF STORES
* var stores = new List<RDFStore>{ waltDisneyStore, waltDisneyStoreFilled };
* var fedFilled = new RDFFederation();
* foreach(var store in stores)
* {
* fedFilled.AddStore(store);
* }
*/
// ITERATE STORES OF A FEDERATION
foreach (var s in fed)
{
Console.WriteLine("Store: " + s);
Console.WriteLine(" Type: " + s.StoreType);
}
}