Sure. Assume I'm developing restaurant web site and I have a image with text like "Chinese veg food", "Chinese non-veg food", "Malaysian veg food",etc., Now when I click on "Chinese food menu" it takes me to the new page contains all the documents in PDF format related to Chinese food.
So, the query in WHERE condition is
typeofdocument LIKE '%veg food menus%' AND documentregions LIKE '%{%CurrentDocument.Parent["Chinese"]|(identity)GlobalAdministrator%}%'
And this results will be wrapped with specific region image on top of the documents.
Will this help you to understand