[Expat-discuss] Newbie Question
Fred L. Drake, Jr.
fdrake at acm.org
Mon Apr 21 10:17:12 EDT 2003
Beckwith, Stephen @ GNS writes:
> 1. Is there a "single" START and END Tag call back function in one's
> program? IF YES, then:
> 2. How does one distinguish the possible "tags" that could be passed back?
> I would think that one would setup the Parser with a list of the "expected"
> tags to be parsed, and then equate each of these with a separate function.
You should review the documentation for XML_SetStartElementHandler();
it only sets one, and doesn't associate it with a tag name. You can
easily wite a wrapper that does the kind of tag-based dispatch you're
suggesting.
> However, my impression is that the parser is written to be "generic" in that
> it only parses to the semantics of what a "tag" is (i.e. it looks for the
> "<" and "/>") and you're left with handling the rest. Am I correct in this
> view?
The tag name and attributes are parsed for you; so whether you're left
with "the rest" depends on how you define "the rest". It's up to you
to perform dispatch based on tag name or other contextual information;
this is something that varies enough between applications that it
can't be fully general, though some widely useful idioms have been
employed (such as tag-name based dispatch).
-Fred
--
Fred L. Drake, Jr. <fdrake at acm.org>
PythonLabs at Zope Corporation
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