/// <summary>
/// Parse the XML for a term
/// </summary>
/// <param name="xmlReader"></param>
/// <param name="ontologyEntries"></param>
/// <param name="mostRecentTerm"></param>
/// <param name="classIdentifier">Identifier from the owl:Class term</param>
/// <returns>Term name</returns>
private string ParseTerm(XmlReader xmlReader, ICollection <OwlEntry> ontologyEntries, string mostRecentTerm, string classIdentifier = "")
{
try
{
var identifier = classIdentifier;
var name = string.Empty;
var definition = string.Empty;
var comment = string.Empty;
var parentTerms = new Dictionary <string, OwlEntry.eParentType>();
var synonyms = new List <string>();
var insideEquivalentClass = false;
var insideIntersectionOf = false;
var insideSubClassOf = false;
var relationshipType = string.Empty;
var termParsed = false;
var startingDepth = xmlReader.Depth;
while (xmlReader.Read())
{
switch (xmlReader.NodeType)
{
case XmlNodeType.Element:
// Start element
switch (xmlReader.Name)
{
case "owl:Class":
if (insideIntersectionOf || insideEquivalentClass || insideSubClassOf)
{
break;
}
if (!string.IsNullOrWhiteSpace(classIdentifier))
{
OnWarningEvent("Nested owl:Class terms; this is unexpected. See term: " + classIdentifier);
}
else if (string.IsNullOrEmpty(name))
{
OnWarningEvent("Nested owl:Class terms; this is unexpected. Most recent term: " + mostRecentTerm);
}
else
{
OnWarningEvent("Nested owl:Class terms; this is unexpected. See term: " + name);
}
break;
case "owl:intersectionOf":
insideIntersectionOf = true;
break;
case "owl:equivalentClass":
insideEquivalentClass = true;
break;
case "rdfs:label":
name = xmlReader.ReadInnerXml();
break;
case "rdfs:subClassOf":
insideSubClassOf = true;
relationshipType = "part_of";
// Look for property rdf:resource
if (xmlReader.HasAttributes)
{
var parentURL = xmlReader.GetAttribute("rdf:resource");
if (GetItemFromURL(parentURL, out var parentTermId))
{
AddParentTerm(parentTerms, "is_a", parentTermId, identifier);
}
}
else
{
// The subclass may have a restriction, e.g.
// <rdfs:subClassOf>
// <owl:Restriction>
// <owl:onProperty rdf:resource="http://purl.obolibrary.org/obo/bto#part_of"/>
// <owl:someValuesFrom rdf:resource="http://purl.obolibrary.org/obo/BTO_0000439"/>
// </owl:Restriction>
// </rdfs:subClassOf>
//
// We'll check for this when looking for element owl:someValuesFrom
}
break;
case "owl:onProperty":
if (insideSubClassOf && xmlReader.HasAttributes)
{
var parentURL = xmlReader.GetAttribute("rdf:resource");
if (GetItemFromURL(parentURL, out var relationshipTypeText))
{
var poundIndex = relationshipTypeText.IndexOf("#", StringComparison.Ordinal);
if (poundIndex >= 0)
{
relationshipType = relationshipTypeText.Substring(poundIndex + 1);
}
else
{
relationshipType = relationshipTypeText;
}
}
}
break;
case "owl:someValuesFrom":
if (insideSubClassOf && xmlReader.HasAttributes)
{
var parentURL = xmlReader.GetAttribute("rdf:resource");
if (GetItemFromURL(parentURL, out var parentTermId))
{
AddParentTerm(parentTerms, relationshipType, parentTermId, identifier);
}
}
break;
case "oboInOwl:id":
identifier = xmlReader.ReadInnerXml();
break;
case "oboInOwl:hasOBONamespace":
// Could parse out the name space
break;
case "oboInOwl:hasRelatedSynonym":
var synonym = xmlReader.ReadInnerXml();
synonyms.Add(synonym);
break;
case "obo:IAO_0000115":
definition = xmlReader.ReadInnerXml();
break;
case "rdfs:comment":
comment = xmlReader.ReadInnerXml();
break;
}
break;
case XmlNodeType.EndElement:
switch (xmlReader.Name)
{
case "rdfs:subClassOf":
insideSubClassOf = false;
break;
case "owl:intersectionOf":
insideIntersectionOf = false;
break;
case "owl:equivalentClass":
insideEquivalentClass = true;
break;
}
if (xmlReader.Depth == startingDepth)
{
termParsed = true;
}
break;
case XmlNodeType.Text:
// Important text should have already been skipped
break;
}
if (termParsed)
{
break;
}
}
var ontologyEntry = new OwlEntry(identifier, name)
{
Definition = definition,
Comment = comment
};
foreach (var parentEntry in parentTerms)
{
ontologyEntry.AddParentTerm(parentEntry.Key, parentEntry.Value);
}
foreach (var synonym in synonyms)
{
ontologyEntry.AddSynonym(synonym);
}
ontologyEntries.Add(ontologyEntry);
return(name);
}
catch (Exception ex)
{
throw new Exception("Exception in ParseTerm: " + ex.Message, ex);
}
}