<http://www.w3.org/XML/>, <http://en.wikipedia.org/wiki/XML>, <http://pl.wikipedia.org/wiki/XML>
<http://pl.wikipedia.org/wiki/Obiektowy_model_dokumentu>, <http://en.wikipedia.org/wiki/Document_Object_Model>
<http://www.w3.org/Style/XSL/>,
<http://pl.wikipedia.org/wiki/XSL>, <http://en.wikipedia.org/wiki/Extensible_Stylesheet_Language>
<http://www.w3.org/XML/Schema>,
<http://en.wikipedia.org/wiki/XML_Schema> <http://pl.wikipedia.org/wiki/XML_Schema>
<http://www.w3.org/TR/REC-xml-names/>,
<http://en.wikipedia.org/wiki/XML_Namespace>, <http://pl.wikipedia.org/wiki/Namespaces_in_XML>
<http://www.swi-prolog.org/packages/sgml2pl.html>
<http://www.swi-prolog.org/packages/rdf2pl.html>
<http://hcs.science.uva.nl/projects/SWI-Prolog/articles/TPLP-plweb.pdf>
<http://www.clip.dia.fi.upm.es/Software/pillow/pillow_doc_html/pillow_doc_toc.html>