[DFDL-WG] Fw: Escape scheme properties that can be expressions

[Steve Hanson]

We took action 168 on the last call to discuss the issue of relative paths 
in expressions for properties in global formats.


168
Relative path expressions in global annotations (Mike)
28/03: Mike to check that allowing relative paths does not cause 
performance problems for an implementation.
05/04:

Just seen this in section 6.3.2. of the spec:  "DFDL expressions that are 
used to provide the value of DFDL properties in the dfd:format annotation 
on the xs:schema MAY NOT contain relative paths".

Regards

Steve Hanson
Architect, Data Format Description Language (DFDL)
Co-Chair, OGF DFDL Working Group
IBM SWG, Hursley, UK
smh at uk.ibm.com
tel:+44-1962-815848
----- Forwarded by Steve Hanson/UK/IBM on 02/04/2012 12:28 -----

From:   Steve Hanson/UK/IBM
To:     dfdl-wg at ogf.org
Date:   14/03/2012 16:09
Subject:        Escape scheme properties that can be expressions


The spec allows the escapeCharacter and escapeEscapeCharacter of DFDL 
escapeScheme to be expressions, in case the characters are supplied 
dynamically in the data stream.
However given that escape schemes are defined globally, should these 
properties be permitted to take relative paths in the expression? 
Today the spec implicitly allows this, meaning an implementation can not 
entirely validate an escapeScheme annotation up front, but must validate 
escapeCharacter and escapeEscapeCharacter at each point of use. 
I'm not sure it makes much sense for the path to be anything than 
absolute.

Regards

Steve Hanson
Architect, Data Format Description Language (DFDL)
Co-Chair, OGF DFDL Working Group
IBM SWG, Hursley, UK
smh at uk.ibm.com
tel:+44-1962-815848





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Unless stated otherwise above:
IBM United Kingdom Limited - Registered in England and Wales with number 
741598. 
Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU





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