xquery functions

Is it true that a lot of functions such as sequence manipulation functions defined in the namespace xf=“http://www.w3.org/2002/08/xquery-functions” are not supported by Tamino query(I am working on Tamino Query Interface)? What kind of other options do I have.

Please see the Tamino documentation. On my system it is linked to:

http://localhost/tamino-v4.2.1.1/Documentation/xqueryref/xqr-functions-toc.htm#xqr-functions-toc