XSLT

XSLT: take an XML doc and, through a sort of "stylesheet", make something with the data (another XML doc, or perhaps a XHTML doc). I don't know this language but I guess it's rather useful (although I have no use for it at the moment).

related stuff: libxml, libxml2, libxslt, xsltproc

Links:
- specifications@w3: http://www.w3.org/TR/xslt

- tutorial@w3: http://www.w3schools.com/xsl/
- http://en.wikipedia.org/wiki/XSLT
- http://en.wikipedia.org/wiki/LibXML