/// <summary>
/// Enlists the broader/broaderTransitive concepts of the given concept within the given scheme
/// </summary>
public static RDFSKOSConceptScheme GetBroaderConceptsOf(this RDFSKOSConceptScheme conceptScheme,
RDFSKOSConcept concept)
{
var result = new RDFSKOSConceptScheme((RDFResource)conceptScheme.Value);
if (concept != null && conceptScheme != null)
{
//Get skos:broader concepts
foreach (var broaderConcept in conceptScheme.Relations.Broader.SelectEntriesBySubject(concept))
{
result.AddConcept((RDFSKOSConcept)broaderConcept.TaxonomyObject);
}
//Get skos:broaderTransitive concepts
result = result.UnionWith(conceptScheme.GetBroaderConceptsOfInternal(concept, null))
.RemoveConcept(concept); //Safety deletion
}
return(result);
}
/// <summary>
/// Subsumes the "skos:broaderTransitive" taxonomy to discover direct and indirect broader concepts of the given scheme
/// </summary>
internal static RDFSKOSConceptScheme GetBroaderConceptsOfInternal(this RDFSKOSConceptScheme conceptScheme,
RDFSKOSConcept concept,
Dictionary <long, RDFSKOSConcept> visitContext)
{
var result = new RDFSKOSConceptScheme((RDFResource)conceptScheme.Value);
#region visitContext
if (visitContext == null)
{
visitContext = new Dictionary <long, RDFSKOSConcept>()
{
{ concept.PatternMemberID, concept }
};
}
else
{
if (!visitContext.ContainsKey(concept.PatternMemberID))
{
visitContext.Add(concept.PatternMemberID, concept);
}
else
{
return(result);
}
}
#endregion
//Transitivity of "skos:broaderTransitive" taxonomy:
//((A SKOS:BROADERTRANSITIVE B) && (B SKOS:BROADERTRANSITIVE C)) => (A SKOS:BROADERTRANSITIVE C)
foreach (var bt in conceptScheme.Relations.BroaderTransitive.SelectEntriesBySubject(concept))
{
result.AddConcept((RDFSKOSConcept)bt.TaxonomyObject);
//Exploit skos:broaderTransitive taxonomy
result = result.UnionWith(conceptScheme.GetBroaderConceptsOfInternal((RDFSKOSConcept)bt.TaxonomyObject, visitContext));
}
return(result);
}