sablotron & xml

Hi, I would like to use xsl stylesheet in a project To do so, i have declared php_sablot.dll in my php.ini as an extension i tried some functions as describe in php help but none worked i got the following message : Fatal error: Call to undefined function: xslt_create() in %devpath%\www\default.php4 on line 21 Is there something special to do ? I have another question : i would like to use DOMDoc library to build some xml source. I can read the source, but i can't modify it. The modification on DomNode objects has no effect on the global document object Thanks in advance, Olivier Marty