/// <summary>
/// Gets a collection of namespace references from the element's
/// parent document and namespace.
/// </summary>
/// <param name="source">The source.</param>
/// <returns>A collection of namespace references from the element's
/// parent document and namespace.</returns>
public static IEnumerable <NamespaceReference> AllNamespaceNodes(this LanguageElement source)
{
if (source == null)
{
throw new ArgumentNullException("source", "source is null.");
}
Contract.Ensures(Contract.Result <IEnumerable <NamespaceReference> >() != null, "Result will not be null.");
var namespaceNodes = Enumerable.Empty <NamespaceReference>();
if (source.InsideNamespace)
{
var parentNamespace = source.GetNamespace();
if (parentNamespace != null)
{
namespaceNodes = parentNamespace.NamespaceReferences();
}
}
var parentDocument = source.GetParentDocument();
if (parentDocument != null)
{
namespaceNodes = parentDocument.NamespaceReferences().Concat(namespaceNodes);
}
return(namespaceNodes);
}