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

[Tim Kimber]

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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