Far from being undocumented functions, these are a sub-set of the ODBC canonical time functions. See MSDN Library: Language Reference: Canonical Functions.

Can be used to build cross-Provider applications. ...

I do believe that Craig is right. In the file License_EXPR_ENU.txt from 2005 Express it states:

4. SCOPE OF LICENSE. The software is licensed, not sold. This agreement...

Why don't you put your easy rules into Table variables so that you can generate something like:

Where members.colname1 in (SELECT colname1 FROM @COLNAME1)

and members.colname2 in (SELECT...

Have you considered constructing a single dynamic query based upon the rules table? You may have to construct some parsing tables and use some table variables, but based upon...