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   Re: [xml-dev] More on taming SAX (was Re: [xml-dev] ANN: Amara XMLToolki

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Jeff Rafter wrote:

> Karl Waclawek has done some work in this area in both Delphi and C# in 
> his toolkit XPEA. But I am sure he will take some ideas from this thread 
> as well... it is all very interesting.

Well, XPEA really is a very low level way of building
some pattern matching on top of SAX (or other push APIs).
Predicate processing as well as attribute matching is done
through call-backs. I am not a big believer in inventing
new languages - my ambitions are a lot more modest.

Example (C# 2.0 syntax):

   IXmlReader reader;
   SaxPathDispatcher<EventStatus> disp = new SaxPathDispatcher<EventStatus>();
   /* Path related set-up */
   Div1Handler div1 = new Div1Handler(...);
   Div2Handler div2 = new Div2Handler(...);
   BasicPathFactory pathFactory = new BasicPathFactory(...);
   // Add path with call-back arguments: "/spec/*//div1[div1]/div2[div2]"
   BasicPath path = pathFactory.Create("/spec/*//div1[0]/div2[1]", div1, div2);

Div1Handler and Div2Handler are implementations of the IElementHandler
interface and their events are called when they match the path above.
Really just one step more than SAX. I use it for writing SAX-based



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