On Fri, Nov 30, 2012 at 6:36 PM, Justin Deoliveira <[email protected]>wrote:
> Interesting... could you elaborate on this jxpath thing? :-)
>>
>
> Sure. Basically the streaming parser, and now the pull parser, needs to
> know when to stop its main parsing cycle and return back to the caller,
> passing back the object at the top of its parsing stack. The streaming
> parser offers three options for this:
>
> 1. An element qname - the name of an element upon which to return when
> hitting its closing edge, for example after every element named
> "gml:featureMember" to stream out feature objects
>
> 2. A java class - A classname for which to return from parsing when a
> binding produces an object of this class, again the common case being to
> parse out all feature objects
>
> 3. An xpath - Same idea as (1) but instead of a simple element name a full
> blown xpath. This could potentially handle things like nested features
> where we only want to stop on the top level features, rather than return
> individual nested features
>
> (1) and (2) is pretty easy, (3) was hard and very expensive because it
> involves continually evaluating the current path to see if it matches the
> xpath specified by the user. And in general never saw all that much use
> afaik. The app schema folks might be using it though.
>
Makes sense to me. The xpath matching seems indeed a niche need.
Cheers
Andrea
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