Figure title wrapping

Hello,

I'm new in xml-transformation and try to transform a docbook-xml (using
saxon-he-10.3, docbook-xsl-1.79.1 and xep 4). Can someone help me to
wrap the figure-title (not overflow the image width). It should be a
solution in the docbook-xml-file for generating fo/pdf and html output.

btw: Is it "easy" possible to create a multi-column-index?

Thanks,
Thomas