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RE: DOM or SAX: Sense and Sensibility

• To: "'michael.h.kay@n...'" <michael.h.kay@n...>, Michael Brennan <Michael_Brennan@A...>, "'bob mcwhirter'" <bob@w...>, xml-dev@l...
• Subject: RE: DOM or SAX: Sense and Sensibility
• From: Michael Brennan <Michael_Brennan@A...>
• Date: Thu, 8 Nov 2001 12:27:06 -0800

> From: Michael Kay [mailto:michael.h.kay@n...]
> Sent: Thursday, November 08, 2001 1:25 AM
> To: 'Michael Brennan'; 'bob mcwhirter'; xml-dev@l...
> Subject: RE:  DOM or SAX: Sense and Sensibility
> 
> 
> > Is anyone working on any XSLT implementations that work with
> > Jaxen? That
> > would be very cool.
> 
> In recent releases of Saxon I've been following a similar 
> direction, of
> making the XPath engine able to work with multiple document 
> representations.
> The current release includes a JDOM driver to illustrate the 
> principle. 

Cool! I'll have to take a look at that.

> Incidentally, some of the things DOM4J and Jaxen are doing 
> look very similar
> to the original "Java only" Saxon library before it changed 
> direction to
> become an XSLT engine.

I did some playing with SAXON about a year and a half ago. I experimented
with a data-binding mechanism that leveraged this capability of SAXON --
implementing ElementHandlers that fired off when certain XPath expressions
were matched. At the time, I didn't follow through with it. I changed course
and ended up implementing something that looks very much like RelaxNGCC
(except without the full schema language -- it used a proprietary language
that resembled a simple subset of TREX). The main impetus for the change in
course was to let developers use a more top-down structured approach rather
than the pattern-matching approach. I find myself gravitating back to the
pattern-matching approach, although I also like the approach of giving the
option to a developer of annotating a schema with the necessary logic, and
letting the tool infer the necessary matching pattern from the context in
the schema. I think that would be an interesting approach for supporting
XSLT templates, too.

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