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> I've often had the requirement to alter/add to the xml as it passed
> through a set of SAXFilters. I've always been under the
> impression that
> to write out the xml at the end of the filter chain I either
> needed to:
>
> A) use DM's XMLWriter or similar
>
> or
>
> B) use a SAXTransformerFactory which allowed me to use setResult() to
> give it a Writer.
>
> Other than that I thought the SAX events were 'lost' by the handler,
> which I've always considered odd. For me, the handler should have the
> ability to write out the xml inbuilt into it, without the need for
> XMLWriter or SAXTransformerFactory.
I'm confused. What do you mean by "the handler"?
>
> Reading here,
>
> http://java.sun.com/j2se/1.4.2/docs/api/javax/xml/transform/sa
> x/SAXTrans
> formerFactory.html#newTransformerHandler()
>
> you can see how I made my assumption.
Sorry, I don't understand what assumption you made, let alone how you made
it!
> How does Saxon go from
> sax events to a Result using an empty TransformerHandler()?
The IdentityTransformerHandler gets SAX events in (originating typically
from a DOMSource, a SAXSource, or a StreamSource), and passes them straight
through to an output method associated with a DOMResult, SAXResult, or
StreamResult. It's a dozen lines of code.
> Is there anything like
> the performance costs of building a tree for the source and
> performing a transform?
>
No.
Michael Kay
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