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   Re: [xml-dev] [ANN] smallx XML Infoset and Pipeline Released (Open Sourc

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* Elliotte Harold <elharo@metalab.unc.edu> [2005-04-14 06:26]:
> Alan Gutierrez wrote:
> >    In my SAX library, XStrategy, I combined namespaces and events.
> >
> >    The XStrategy framwork maintains a stack of namespaces in scope
> >    by default. It seemed impossible to get anything done without it.
> If you're int he unfortunate situation of needing to resolve namespace 
> prefixes in attribute values and element content, as is the case in an 
> XSLT processor or a schema validator, then you absolutely need to do 
> this. However, probably at least 90% of use cases are much simpler and 
> just need to know the namespaces of each element and attribute, and this 
> doesn't require any extra work.
> It's not all that hard to keep track of namespaces in scope in SAX. You 
> just use a NamespaceSupport object, push the namespace on in 
> startPrefixMapping and pop it off in endPrefixMapping. Sadly this isn't 
> as well documented or obvious as it should be.

    The key to XStrategy is a second event system that sends
    messages up a stack event handlers. It's API is stabilizing, and
    I'm finding that the reusable strategies, and the bubbling event
    model solve a lot of problems easily.

    With SAX I find that I'm not trying to shave every instruction,
    simply avoiding the overhead of tree materialization.

    If I really needed to strip every last bit overhead, I'd use
    SAX. I like that I've got namespaces in scope and the stack of
    events, amoung other things, encapsulated. It is good to have
    them there when I need them.


Alan Gutierrez - alan@engrm.com
    - http://engrm.com/blogometer/index.html
    - http://engrm.com/blogometer/rss.2.0.xml


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