public NamespaceEntity GetNamespace(string ns)
{
string[] namespaceHierarchy = ns.Split('.');
string topLevelName = namespaceHierarchy[0];
NamespaceEntity topLevel = GetTopLevelNamespace(topLevelName);
NamespaceEntity current = topLevel;
for (int i=1; i<namespaceHierarchy.Length; ++i)
{
current = current.GetChildNamespace(namespaceHierarchy[i]);
}
return current;
}