[xml] Preserving the SAX tutorial

[Murray Cumming <murrayc murrayc com>]

We are moving most good GNOME documentation out of developer.gnome.org,
usually into library.gnome.org. That should mean that it's better
organized, kept up-to-date, and translated.

This libxml SAX tutorial seems to still be relevant and useful. Would
you like to add it to the regular libxml documentation. James, is that
OK?
http://developer.gnome.org/doc/tutorials/xml-sax/xml-sax.html

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