public static bool IsXsdDatatype(this OntologyClass oClass)
{
if (oClass.IsNamed())
{
return oClass.GetIri().ToString().StartsWith(XmlSpecsHelper.NamespaceXmlSchema, StringComparison.Ordinal);
}
return false;
}
public static IEnumerable <string> DtdlTypes(this OntologyClass oClass)
{
if (oClass.IsNamed())
{
return(oClass.GetUriNode().DtdlTypes());
}
return(new List <string>());
}
public static bool IsXsdDatatype(this OntologyClass oClass)
{
if (oClass.IsNamed())
{
return(oClass.GetUri().AbsoluteUri.StartsWith(XmlSpecsHelper.NamespaceXmlSchema, StringComparison.Ordinal));
}
return(false);
}
public Relationship(OntologyProperty property, OntologyClass target)
{
if (!property.IsNamed() || !(target.IsNamed() || target.IsDatatype()))
{
throw new ArgumentException("Only named properties and named or datatype targets allowed.");
}
Property = property;
Target = target;
}
public static IEnumerable <Relationship> GetRelationships(this OntologyClass cls)
{
List <Relationship> relationships = new List <Relationship>();
// Start w/ rdfs:domain declarations. At this time we only consider no-range (i.e.,
// range is owl:Thing) or named singleton ranges
IEnumerable <OntologyProperty> rdfsDomainProperties = cls.IsDomainOf.Where(
property =>
property.Ranges.Count() == 0 ||
(property.Ranges.Count() == 1 && (property.Ranges.First().IsNamed() || property.Ranges.First().IsDatatype())));
foreach (OntologyProperty property in rdfsDomainProperties)
{
Relationship newRelationship;
if (property.Ranges.Count() == 0)
{
OntologyGraph oGraph = cls.Graph as OntologyGraph;
OntologyClass target;
if (property.IsObjectProperty())
{
target = oGraph.CreateOntologyClass(VocabularyHelper.OWL.Thing);
}
else
{
target = oGraph.CreateOntologyClass(VocabularyHelper.RDFS.Literal);
}
newRelationship = new Relationship(property, target);
}
else
{
OntologyClass range = property.Ranges.First();
newRelationship = new Relationship(property, range);
}
if (property.IsFunctional())
{
newRelationship.ExactCount = 1;
}
relationships.Add(newRelationship);
}
// Continue w/ OWL restrictions on the class
IEnumerable <OntologyRestriction> ontologyRestrictions = cls.DirectSuperClasses
.Where(superClass => superClass.IsRestriction())
.Select(superClass => new OntologyRestriction(superClass));
foreach (OntologyRestriction ontologyRestriction in ontologyRestrictions)
{
OntologyProperty restrictionProperty = ontologyRestriction.OnProperty;
OntologyClass restrictionClass = ontologyRestriction.OnClass;
if (restrictionProperty.IsNamed() && (restrictionClass.IsNamed() || restrictionClass.IsDatatype()))
{
Relationship newRelationship = new Relationship(restrictionProperty, restrictionClass);
int min = ontologyRestriction.MinimumCardinality;
int exactly = ontologyRestriction.ExactCardinality;
int max = ontologyRestriction.MaximumCardinality;
if (min != 0)
{
newRelationship.MinimumCount = min;
}
if (exactly != 0)
{
newRelationship.ExactCount = exactly;
}
if (max != 0)
{
newRelationship.MaximumCount = max;
}
relationships.Add(newRelationship);
}
}
// Iterate over the gathered list of Relationships and narrow down to the most specific ones, using a Dictionary for lookup and the MergeWith() method for in-place narrowing
Dictionary <OntologyProperty, Relationship> relationshipsDict = new Dictionary <OntologyProperty, Relationship>(new OntologyResourceComparer());
foreach (Relationship relationship in relationships)
{
OntologyProperty property = relationship.Property;
OntologyResource target = relationship.Target;
// If we already have this property listed in the dictionary, first narrow down the relationship by combining it with the old copy
if (relationshipsDict.ContainsKey(property))
{
Relationship oldRelationship = relationshipsDict[property];
relationship.MergeWith(oldRelationship);
}
// Put relationship in the dictionary
relationshipsDict[property] = relationship;
}
// Return the values
return(relationshipsDict.Values);
}
public static bool IsOwlThing(this OntologyClass oClass)
{
return(oClass.IsNamed() && oClass.GetUri().AbsoluteUri.Equals(OWL.Thing.AbsoluteUri));
}
public static bool IsRdfsLiteral(this OntologyClass oClass)
{
return(oClass.IsNamed() && oClass.GetUri().AbsoluteUri.Equals(VocabularyHelper.OWL.Thing.AbsoluteUri));
}
public static bool IsOwlThing(this OntologyClass cls)
{
Uri owlThing = new Uri("http://www.w3.org/2002/07/owl#Thing");
return(cls.IsNamed() && cls.GetIri().Equals(owlThing));
}
public static bool IsTopNamedClass(this OntologyClass cls)
{
return(cls.IsNamed() && !cls.DirectSuperClasses.Any(superCls => superCls.IsNamed() && !superCls.Resource.ToString().Equals("http://www.w3.org/2002/07/owl#Thing")));
}