XSLT and PHP

I have been impressed with using the xslt functions in php in that it gives you the ability to separate content from presentation. Now I am looking to streamline this technique. Typically I either take xml that is in a file or generated by a class from a sql query and transform it with an xsl file. The great part is anything to do with content or code is completely separate from presentation. However, if I ever need to change the presentation (xsl files) I still have one xsl file for every "page" on the site to edit. I have tried to make xsl files use includes (php includes) without much success. I am looking into xsl includes. What I am looking for is either a way to use includes in xsl stylesheets or something like Fusebox layouts for xml/xsl. Thank you