Please add/correct to give an idea of what actually works now.





XBL1, or XBL

============

http://developer.mozilla.org/en/docs/XBL:XBL_1.0_Reference is the

thing that comes closest to what is actually implemented in releases

of Mozilla browsers up to at least Firefox 3.

- http://mozilla.doslash.com/xblschema holds the RNG and generated XSD

- http://spket.com/xul.html shows an editor with XBL specific

functionality (code completion mainly(?)) and

http://addons.mozilla.org/en-US/firefox/addon/3953 is a reference tool

- google for XBL and you'll find working examples (Mozilla extensions,

HTML+XBL and a few SVG+XBL)



sXBL (s=SVG)

============

http://www.w3.org/TR/sXBL/ ('eternal draft, including Schema') is

partly implemented in Batik 1.7 versions, see

http://wiki.apache.org/xmlgraphics-batik/SupportedSVG12Features for

current status



XBL2

====

http://w3.org/TR/xbl (candidate recommendation since March 16) is

being implemented by Mozilla, to replace XBL1 at some point (after

Firefox3 for sure)