xml-dev - RE: [xml-dev] Validate an XPath with regex

RE: [xml-dev] Validate an XPath with regex

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To: "'Niels Peter Strandberg'" <nielspeter@npstrandberg.com>,<xml-dev@lists.xml.org>
Subject: RE: [xml-dev] Validate an XPath with regex
From: "Michael Kay" <michael.h.kay@ntlworld.com>
Date: Thu, 4 Apr 2002 09:46:40 +0100
Importance: Normal
In-reply-to: <3B1C9D22-47A6-11D6-8473-000502CB905D@npstrandberg.com>
Reply-to: <michael.h.kay@ntlworld.com>

> Shouldn't it be possible to validate the syntax of an XPath
> string using regular expressions.

I'm not a grammar expert, but I do know that the class of grammars that can
be parsed using regular expressions is smaller than the class that can be
parsed using "BNF". XPath falls into the latter category, not the former.

Michael Kay
Software AG
home: Michael.H.Kay@ntlworld.com
work: Michael.Kay@softwareag.com

References:
- Validate an XPath with regex
  - From: Niels Peter Strandberg <nielspeter@npstrandberg.com>

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