Programlisting without page break but with border

Hello

I want to see all my "programlisting"-parts with a border.
In advance every programlisting must be on the same page (in other words: ever listing must not be broken by PDF-Page breaks).

I use apache sytlesheets to process fo to pdf.

I could use an "informaltable"; but this is not the docbook-style: I don't like to use another tag just for a foramtting issue.

Any experience? Can this be customized with a simple XSLT-Elment?

Thanks in advance