/// <summary>
/// Implementation of an OwlEdge.
/// </summary>
/// <param name="edge">The actual edge to be visited</param>
/// <param name="parent">The parent object (node) of the edge</param>
public override void Visit(OwlEdge edge, Object parent)
{
XmlElement parentElement = parent as XmlElement;
if (parentElement != null)
{
Uri uri = new Uri(edge.ID);
// Retrieve the local name from the uri
string localName = uri.Fragment.Substring(1, uri.Fragment.Length - 1);
// Get the path, up to the local name, from the uri
string path = uri.GetLeftPart(UriPartial.Path) + "#";
string prefix;
// Check for the namespace of the edge in order to get the correct prefix
if (path == OwlNamespaceCollection.OwlNamespace)
{
prefix = OwlNamespaceCollection.OwlNamespacePrefix;
}
else if (path == OwlNamespaceCollection.RdfNamespace)
{
prefix = OwlNamespaceCollection.RdfNamespacePrefix;
}
else if (path == OwlNamespaceCollection.RdfSchemaNamespace)
{
prefix = OwlNamespaceCollection.RdfSchemaNamespacePrefix;
}
else
{
// If the namespace of the edge is something else, then look for it
prefix = "";
if (path != _baseUri)
{
// Search for the prefix of this individual
int pos = _namespaces[path].IndexOf(':');
if (pos != -1)
{
prefix = _namespaces[path].Substring(++pos);
}
}
}
string qualifiedName = (prefix.Length != 0) ? (prefix + ":" + localName) : localName;
// At this point we will not generate the rdf:type edges.
XmlElement edgeElement = _owlDocument.CreateElement(qualifiedName, path);
// Check to see if the child node is an anonymous one or not. If it is, then further
// process that node, otherwise just reference it by name.
OwlNode node = (OwlNode)edge.ChildNode;
if (node.IsAnonymous() || node.IsLiteral())
{
node.Accept(this, edgeElement);
}
else
{
// Add the name as one of its attributes
XmlAttribute nameAttribute = _owlDocument.CreateAttribute("rdf", "resource", OwlNamespaceCollection.RdfNamespace);
nameAttribute.Value = GetNodeReference(node);
edgeElement.Attributes.Append(nameAttribute);
}
parentElement.AppendChild(edgeElement);
}
}
