We already use lengthKind='implicit'
to mean 'parse this structure normally, and its length will become apparent'.
I think it would be consistent to use
occursKind='implicit' to mean 'parse this array normally, and the number
of occurrences will become apparent'.
Similarly, I think it would be consistent
to allow dfdl:initiatedContent ( with the new discriminating behaviour
) on an array, because we allow it on all other points of uncertainty (
or do we? ).
regards,
Tim Kimber, Common Transformation Team,
Hursley, UK
Internet: kimbert@uk.ibm.com
Tel. 01962-816742
Internal tel. 246742
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| dfdl-wg Digest, Vol 36, Issue 6 |
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Today's Topics:
1. Missing OccursCountKind (Alan Powell)
----------------------------------------------------------------------
Message: 1
Date: Tue, 11 Aug 2009 16:18:16 +0100
From: Alan Powell <alan_powell@uk.ibm.com>
Subject: [DFDL-WG] Missing OccursCountKind
To: dfdl-wg@ogf.org
Message-ID:
<OFD7E1715D.30B1C83D-ON8025760F.005278A0-8025760F.005410AB@uk.ibm.com>
Content-Type: text/plain; charset="iso-8859-1"
Tim has pointed out that as currently defined it is not possible to define
an array where the number of occurrences is determined by the initiator.
For example
Scalar1: xxxxx
Array: xxxx
Array: xxxx
Scalar2: xxx
It is inconsistent that dfdl can identify optional elements using
speculative parsing but not a variable number of occurrences.
occursCountKind
Enum
Specifies how the actual number of occurrences is to be established.
Valid values ?stopValue?, ?explicit?, 'implicit'? or ?useAvailableSpace?
?explicit? means use the value of the dfdl:occursCount property.
?implicit? means use the value of the maxOccurs on the declaration. It
is
a schema definition error if the value for minOccurs is not equal to
maxOccurs.
?useAvailableSpace? means the occurrences fill the available space which
is limited by a containing construct.
?stopValue? means look for a logical stop value which signifies the end
of
the occurrences.
Annotation: dfdl:element
Suggestions for new enumeration:
'parsed' , The number of occurrences is determined by parsing until
a
non-matching element is encountered.
change 'implicit' to mean between minOccurs and maxOccurs
As an addition should we allow the dfdl:initiatedContent property on
arrays if we agree to make it discriminating?
initiatedContent
Booloean
When 'true' indicates that all the children of the sequence are initiated.
It is a schema definition error if any children have their dfdl:initiator
property set to the empty string.
When 'false', the children of the sequence may have their dfdl:initiator
property set to the empty string.
Annotation: dfdl:sequence, dfdl:choice, dfdl:group
Alan Powell
MP 211, IBM UK Labs, Hursley, Winchester, SO21 2JN, England
Notes Id: Alan Powell/UK/IBM email: alan_powell@uk.ibm.com
Tel: +44 (0)1962 815073
Fax: +44 (0)1962 816898
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