Re: namespace-prefixes

[Elliotte Rusty Harold]

By the way, if you're curious you can look at the code for 
SAXParserFactory (and its default concrete subclass in Java 1.4) in 
the Apache Crimson CVS (which is ungodly slow today, not sure why). 
It's easy to see that it never returns any parser other than Crimson, 
regardless of what features you ask for. Of course, other 
implementations like Xerces will return different defaults. But the 
SAXParserFactory will not iterate through all installed parsers 
looking for one that satisfies all the requested features. I suppose 
you can imagine one that does that, but I've never seen one like 
that, and the one in Java 1.4 certainly doesn't do that.

What's really strange though is that when you try to set a feature on 
the factory, then the factory actually creates an XMLReader to see if 
an exception is thrown, and then throws the reader away! In other 
words. SAXParserFactory.setFeature() invokes XMLReader.setFeature()! 
The SAXParserFactory doesn't even know what features it can support 
until the XMLReader tells it! Talk about a hack. Check it out for 
yourself:

http://cvs.apache.org/viewcvs.cgi/xml-crimson/src/org/apache/crimson/jaxp/

--

  Elliotte Rusty Harold
  [EMAIL PROTECTED]
  Effective XML (Addison-Wesley, 2003)
  http://www.cafeconleche.org/books/effectivexml            
  http://www.amazon.com/exec/obidos/ISBN%3D0321150406/ref%3Dnosim/cafeaulaitA