If you have ever wanted to have a detail explanation about the process to transfer doc properties to column properties when you upload a document to SharePoint, here is a really nice series of articles: http://blogs.msdn.com/b/andrew_may/archive/2006/07/14/sharepointbeta2documentparseroverview1.aspx http://blogs.msdn.com/b/andrew_may/archive/2006/07/14/sharepointbeta2documentparseroverview2.aspx http://blogs.msdn.com/b/andrew_may/archive/2006/07/14/sharepointbeta2documentparseroverview3.aspx http://blogs.msdn.com/b/andrew_may/archive/2006/07/14/sharepointbeta2documentparseroverview4.aspx