- From: Sverre Hvammen Johansen <sj@birdstep.com>
- Date: 11 Dec 2001 16:38:43 +0100
- To: www-xml-schema-comments@w3.org
I am working on an implementation of regular expression based on the specification found in XML Schema Part 2, appendix E. I have found one construct which is ambiguous: [.] There are two possible leftmost derivations for this construct: regExp => branch => piece => atom => charClass => charClassExpr => '[' charGroup ']' => '[' posCharGroup ']' => '[' charRange ']' => '[' XmlCharInDash ']' => '[.]' and: regExp => branch => piece => atom => charClass => charClassExpr => '[' charGroup ']' => '[' posCharGroup ']' => '[' charClassEsc ']' => '[' MultiCharEsc ']' => '[.]' The first alternative gives the single character '.' while the second gives the multi character escape 'any character'. I expect that the first alternative is the intended solution for the specification. I suggest to change the specification to the following: [11] charClass ::= charClassEsc | charClassExpr | '.' [37] MultiCharEsc::= '\' [sSiIcCdDwW] -- Birdstep Technology Sverre Hvammen Johansen Office: +47 24 13 47 00 Direct: +47 24 13 47 76 Web: www.birdstep.com Mobile: +47 45 03 23 74
Received on Tuesday, 11 December 2001 11:04:47 UTC