startPrefixMapping for xmlns?

Here's one I'm not sure of. ContentHandler.startPrefixMapping says

There should never be start/endPrefixMapping events for the "xml" 
prefix, since it is predeclared and immutable.

What about the xmlns prefix? Should we say something like this:

Likewise, there should never be start/endPrefixMapping events for the 
"xml" prefix, regardless of the setting of the xmlns-uris feature, 
because whichever way xmlns-uris is set, the xmlns prefix is predeclared 
and immutable.

Or is this maybe not true, and SAX does fire prefix mapping events for 
xmlns?

--
Elliotte Rusty Harold



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