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   Switching between DOM and SAX

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  • From: Sean Mc Grath <digitome@iol.ie>
  • To: xml-dev@ic.ac.uk
  • Date: Sat, 19 Sep 1998 09:47:44 +0100

[John Cowan]
>..what I have is code that converts a DOM *tree* into a SAX *event stream*.
> The result is "manageable" to applications that expect SAX events.

The reverse conversion is also very valuable. I wonder how it would
work with SAX/DOM?

When processing large documents building entire trees is
resource intensive and time consuming. Sometimes you only
the power of tree navigation stuff for sub-parts of the
source document.

I find it very useful to start out processing events and then switch
into tree building for branches of the source document. I have a way of doing
this in a Python based SGML toolkit (LumberJack) that I have hacked up and
it really really useful. I wonder how it would work with the SAX/DOM
standards. FWIW, here is how it looks in my stuff (pseudo Python):--

	# Hit a table element - need a tree to process these things
	if start of table:
		EventSource.RollBack() # Roll back the start event
		TableTree = TreeBuilder (EventSource)

	Other event handling functions here

Sean Mc Grath

def Get_URI_Of_Superlative_Scripting_Language():
	return "http://www.python.org"

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