public static bool GetAttributeGroup( String targetNamespace, String name,
out XmlSchemaAttributeGroup attributeGroup)
{
bool found = false;
attributeGroup = null;
if (Instance._attributeGroups.ContainsKey( targetNamespace + ":" + name ))
{
found = true;
attributeGroup = Instance._attributeGroups[targetNamespace + ":" + name];
}
return found;
}