Do you want to get a XHTML Strict page from a DocBook XML?
- write a valid DocBook XML :);
- follow the Strict XHTML guidelines;
- download the latest docbook-xsl;
- download the latest TLDP XSL Style Sheets;
- taking the idea from DocBookCssStylesheets (it didn’t work directly as suggested) and using this style.css CSS I got it with this bulk script.