/// <summary>
///
/// </summary>
/// <param name="data"></param>
/// <param name="co"></param>
/// <param name="filename"></param>
/// <param name="description"></param>
/// <returns></returns>
public string AddSupportingFile(Stream data, ContentObject co, string filename, string description)
{
string dsid = _fileStore.AddSupportingFile(data, co, filename);
_metadataStore.AddSupportingFile(co, filename, description, dsid);
return(dsid);
}