private Task<XmlDocumentWithNamespaceManager> GetAddressBookHomeSet (Uri url)
{
return _webDavClient.ExecuteWebDavRequestAndReadResponse (
url,
"PROPFIND",
0,
null,
null,
"application/xml",
@"<?xml version='1.0'?>
<D:propfind xmlns:D=""DAV:"" xmlns:A=""urn:ietf:params:xml:ns:carddav"">
<D:prop>
<A:addressbook-home-set/>
</D:prop>
</D:propfind>
"
);
}