How do you set a Managed Metadata field when using SharePoint Copy Web Service?

I am using the SharePoint Copy web service to upload a file to a document library. The library is using a content type that contains a managed metadata field. I can not figure out how to update this field by using the FieldInformation class. I have not had any issues setting any of the other fields using this method. An example of how I am uploading the file with the FileInformation can be found here

I have tried to set the field via its Display Name as well as the "hidden" note field with the same name plus 0.

SharePointCopyWebService.FieldInformation fieldInfo = new SharePointCopyWebService.FieldInformation开发者_如何学JAVA();
fieldInfo.DisplayName = "Internal Audit Topics_0";
fieldInfo.Type = SharePointCopyWebService.FieldType.Note;
fieldInfo.Value = "Known Term";
fieldInfoArray.Add(fieldInfo);

Additional Info:

• This is running inside a Win Forms application
• I am not allowed to use the SharePoint Server/Client Object Models

Any ideas on how to update the managed metadata field with the FieldInformation class?

The managed metadata field has a format similar to the lookup field (i.e. "id;#value") except it requires the guid of the term label e.g. "id;#TermLabel|xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"

This will work, but forcing external applications to know the correct value of the guids pretty much ruins this feature for updating from external systems.