On Sun, 2011-06-05 at 11:19 +0800, Daniel Veillard wrote: > On Fri, Jun 03, 2011 at 05:34:03PM +0200, Tomáš Pospíšil wrote: > > Hi Daniel and all hackers, > > > > I'm GSoC student creating new XML index in PostgreSQL which use > LibXML for handling XML documents. My idea about index is about to use > node offsets and Patricia Trie for mapping structural information to > our internal representation tree index. So how can I get offset of > nodes?
Before you get too far you might want to look at xqilla and dbxml - presumably your goal will be to support XQuery, and you'll want the parser and XPath 2 engine for that (unless PostgreSQL already has XQuery support?). You might continue on your current course, of course, but take a look. Maybe you did that already. Patricia trees can be fast (PAT used to use them, years ago, a spin-off from the University of Waterloo called OpenText), but they are difficult to update, so if you plan to support XQuery Update, e.g. to replace a single text node in a 500 MByte XML document, it might not be the best choice. Liam -- Liam Quin - XML Activity Lead, W3C, http://www.w3.org/People/Quin/ Pictures from old books: http://fromoldbooks.org/ _______________________________________________ xml mailing list, project page http://xmlsoft.org/ xml@gnome.org http://mail.gnome.org/mailman/listinfo/xml
