[DFDL-WG] DFDL Regular Expression proposal

[Alan Powell]

Attached is the proposal for the regular expression syntax used to 
determine element length.

Highlights
Based on the XML Schema regular expression subset used by WebSphere 
Message Broker.
Only applies to representation = text
Uses LengthPattern property rather than decorated syntax to distinguish 
from literals and regular expressions as it is only used in one place, 
this avoids everywhere else having to escape the decoration character and 
we are running out of decoration characters.
Assumes the pattern is converted to the data code page before matching 
against the data stream.



 Comments and improvements as soon as possible please.


Alan Powell

 MP 211, IBM UK Labs, Hursley,  Winchester, SO21 2JN, England
 Notes Id: Alan Powell/UK/IBM     email: alan_powell at uk.ibm.com 
 Tel: +44 (0)1962 815073                  Fax: +44 (0)1962 816898






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