Re: lazy xml teaser

[John Belmonte <john@...>]

Jay Carlson wrote:
> Why is this interesting?  Trees are a natural data model to process
> XML documents.  A simple tree implementation reads the entire document
> into memory at once.  For large documents, this can be too expensive.
> Although callback and event APIs are memory-efficient, they are
> painful to program to.
>
> Lazynode constructs an conventional-seeming XML tree as its contents
> are referenced, parsing more source document as necessary to fill out
> the contents on demand.

I understand how this could save memory in a Lua table represent ion of 
an XML document.  The "parsing more source document as necessary" is 
arguable.  I've found it best to run an XML document through a validator 
like relax-ng before using it, relieving my program from the task of 
ad-hoc validation.  Considering this, the XML often has already been 
parsed before your program gets to it.

-John


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