how do I pass XML arguments (*not* name/value parameters) to the XSLT
processor that could be retrieved with document()? The processor and
API have changed in PHP 5 and now I'm struggling to find a way. Should
I imitate files using stream wrappers in some way? :/

You can call your own PHP5 function within XSLT transformation. If such
function returns DOM node or node-list, it can be used to simulate
passing of DOM trees without need for serialization/deserialization. See

http://cz2.php.net/manual/en/function.xsl-xsltprocessor-register-php-function
s.php

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