[DFDL-WG] do we allow indexing of non-array, non-optional

[Steve Hanson]

Agreed on call not to add any extra restriction but a DFDL implementation 
is free to issue a warning if it detects such usage.

Regards
 
Steve Hanson
Architect, IBM DFDL
Co-Chair, OGF DFDL Working Group
IBM SWG, Hursley, UK
smh at uk.ibm.com
tel:+44-1962-815848



From:   Tim Kimber/UK/IBM at IBMGB
To:     dfdl-wg at ogf.org
Date:   16/10/2014 05:58
Subject:        Re: [DFDL-WG] do we allow indexing of non-array, 
non-optional
Sent by:        dfdl-wg-bounces at ogf.org



I don't think we should depart from the standard XPath rules any more than 
is necessary. Sometimes an XPath author will put [1] after every scalar 
element as a matter of habit, because it makes the execution of the 
expression faster ( in some XPath processors ). 

regards,

Tim Kimber, 
Technical Lead for IBM Integration Bus Healthcare Pack
Hursley, UK
Internet:  kimbert at uk.ibm.com
Tel. 01962-816742 
Internal tel. 37246742




From:        Mike Beckerle <mbeckerle.dfdl at gmail.com> 
To:        "dfdl-wg at ogf.org" <dfdl-wg at ogf.org> 
Date:        15/10/2014 22:05 
Subject:        [DFDL-WG] do we allow indexing of non-array, non-optional 
Sent by:        dfdl-wg-bounces at ogf.org 



I don't recall whether we decided this matter or not. I would search for 
it myself, but I tried and failed to find anything. This is a hard topic 
to do searching on... no good keywords.

If element 'e' has maxOccurs = 1, minOccurs = 1 (or neither are 
mentioned), is e[1] a valid expression? what about 
e[../some/pathExp/here]?

If element 'e' has minOccurs= 0 maxOccurs = 1, is e[1] a valid expression, 
or do you access an optional element just by ../e ? 


Mike Beckerle | OGF DFDL Workgroup Co-Chair | Tresys Technology | 
www.tresys.com 
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