protected async Task<bool> IsResourceType (string @namespace, string name)
{
var properties = await GetResourceType (_serverUrl);
XmlNode resourceTypeNode = properties.XmlDocument.SelectSingleNode (
string.Format ("/D:multistatus/D:response/D:propstat/D:prop/D:resourcetype/{0}:{1}", @namespace, name),
properties.XmlNamespaceManager);
return resourceTypeNode != null;
}