[basex-talk] Unknown function db:open

I'm using basex 11.2 under WSL ubuntu 24.04 when I use the command xquery count(db:open('some')/*), I see an error message about db prefix being undefined. The same thing from an editor tab. import module namespace db = 'http://basex.org/modules/db'; count(db:open('some')/*) I get the same error message. Is this to be expected? How can I supply what is needed? Thanks, Kendall Shaw