How to handle unused Managed Metadata Terms without a WssId?

The Problem

We upload (large amounts of) files to SharePoint using FrontPage RPC (put documents call). As far as we've been able to find out, setting the value of taxonomy fields through this protocol requires their WssId.

The problem is that unless terms have been explicitly used before on a listitem, they don´t seem to have a WSS ID. This causes uploading documents with previously unused metadata terms to fail.

The Code

The call TaxonomyField.GetWssIdsOfTerm in the code snippet below simply doesn´t return an ID for those terms.

SPSite site = new SPSite( "http://some.site.com/foo/bar" );
SPWeb web = site.OpenWeb();

TaxonomySession session = new TaxonomySession( site ); 
TermStore termStore = session.TermStores[new Guid( "3ead46e7-6bb2-4a54-8cf5-497fc7229697" )];
TermSet termSet = termStore.GetTermSet( new Guid( "f21ac592-5e51-49d0-88a8-50be7682de55" ) );
Guid termId = new Guid( "a40d53ed-a017-4fcd-a2f3-4c709272eee4" );

int[] wssIds = TaxonomyField.GetWssIdsOfTerm( site, termStore.Id, termSet.Id, termId, false, 1);

foreach( int wssId in wssIds )
开发者_如何学C{
    Console.WriteLine( wssId );
}

We also tried querying the taxonomy hidden list directly, with similar results.

The Cry For Help

Both confirmation and advice on how to tackle this would be appreciated. I see three possible routes to a solution:

• Change the way we are uploading, either by uploading the terms in a different way, or by switching to a different protocol.
• Query for the metadata WssIds in a different way. One that works for unused terms.
• Write/find a tool to preresolve WssIds for all terms. Suggestions on how to do this elegantly are most welcome.

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setting the WssID value to -1 should help you. I had similar problem (copying documents containing metadata fields) between two different web applications. I've spent many hours on solving strange metadata issues. In the end, setting the value to -1 have solved all my issues. Even if the GetWssIdsOfTerm returns a value, I've used -1 and it works correctly. Probably there is some background logic that will tak care of the WssId.

Radek