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Re: SAX-J and the DPH (DJH?)

• From: Chris Maden <crism@o...>
• To: xml-dev@i...
• Date: Wed, 31 Dec 1997 14:16:18 -0500

[Sean McGrath]
> So this works if:
> 
>  1) No more than 1 telephone number per line [Chris]

For my trivial solution.  Perl can handle multiple matches per line;
I'm just not very sophisticated yet.

>  2) No cdata marked sections [Chris]

Can be handled by looking for CDATA marked section starts and ends,
using code similar to the appendix, and adding && !$incdata to all
element-matching conditionals.

>  3) The attribute value literal for client does not have any entity
> references [Sean - suggested]
>  4) The target telephone number does not contain entity references
> [Sean - suggested ]

The two real problems in this list.

>  5) appendix elements do not nest [Sean - suggested]

Not a problem - keep a reference counter instead of my trivial boolean
approach.  (Appendices rarely nest, but this is applicable to other
kinds of elements.)

>  6) Telephone numbers do not nest (problem if regexp matching is
> greedy) [Sean - suggested]

The regexp is greedy, but I can use a pattern that will only match
single elements.

> Others? I think a little list of "gotchas" like this would find the
> way onto many a DPH's wall (including mine!).

There are only two real problems here, the ones with entity
references.  These are, on their face, beyond the scope of a DPH.  I
would either (a) do a quick grep to see if I need to worry about it,
or (b) run my script on the output of spam or a similar normalizer.

I don't think anyone has claimed that Perl can address everything; as
David (I think) said, there is a large fuzzy gray line between
problems in the Perl domain and problems in the full XML processor
domain.  (The assertion can be proven by the fact that a Perl script
can solve arbitrary XML processing problems, but will, in the course
of doing so, eventually implement a full XML processor.)

-Chris
-- 
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• References:
  • Re: SAX-J and the DPH (DJH?)
    • From: Sean Mc Grath <digitome@i...>

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