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- Subject: Re: lazy xml teaser
- From: John Belmonte <john@...>
- Date: Mon, 23 Feb 2004 11:08:04 -0500
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.
http:// if ile.org/