I know, the same namespace
Here is the JSP docs:
The proprietary tags are at the bottom of the doc:
Generally if a custom JSP tag has the same name as a PD4ML proprietary tag, the JSP tag simply replicates itself and lets PD4ML runtime to process it. The rest of JSP custom tags are mapped to PD4ML API.
Regarding your particular issues:
Your JSP should look like the following:
I also removed more-less outdated clean_xhtml as the current version of our HTML renderer “understands” XHTML quite good.