Use XPATH string to get current page number and add blank page if it finishes in odd page

Dear community,

I'm a newbie in Arbortext Styler and Xpath.

What I want to do:

(1) after a tag, using the "Gentext" "Add after element Context" feature, test if it is an even page;

(2) if I get an even page, insert an ufe (user formatting element), with a blank page;

I was wondering if I can insert a XPathString in order to do this test.

Detailed instructions how to do that will be very welcome!

Thank you in advance,