[DFDL-WG] proposed clarification/narrowing - delimited binary data should decimal
Steve Hanson
smh at uk.ibm.com
Tue Sep 4 12:30:10 EDT 2012
Ratified on WG call 4th Sept 2012.
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
From: Tim Kimber/UK/IBM at IBMGB
To: Steve Hanson/UK/IBM at IBMGB
Cc: dfdl-wg at ogf.org, dfdl-wg-bounces at ogf.org
Date: 21/08/2012 14:15
Subject: Re: [DFDL-WG] proposed clarification/narrowing - delimited
binary data should decimal
Sent by: dfdl-wg-bounces at ogf.org
re: "If we are in agreement then we need to take an errata on section 12
and particularly section 12.3.8 to allow xs:hexBinary to have lengthKind
'delimited'. "
I agree
regards,
Tim Kimber, Common Transformation Team,
Hursley, UK
Internet: kimbert at uk.ibm.com
Tel. 01962-816742
Internal tel. 246742
From: Steve Hanson/UK/IBM at IBMGB
To: Mike Beckerle <mbeckerle.dfdl at gmail.com>
Cc: dfdl-wg at ogf.org, dfdl-wg-bounces at ogf.org
Date: 20/08/2012 03:04
Subject: Re: [DFDL-WG] proposed clarification/narrowing - delimited
binary data should decimal
Sent by: dfdl-wg-bounces at ogf.org
Mike
The correct title of this proposal is "proposed relaxation - delimited
binary data should be packed or BCD or BLOB"
Section 12.3.8 states what binary reps can be used with lengthKind
'delimited'. It explicitly lists just 'packed' and 'bcd'. Therefore
binary numbers with binaryNumberRep 'binary', binary calendars with
binaryCalendarRep 'binarySeconds' and 'binaryMilliseconds', binary floats
and doubles, binary booleans and xs:hexBinary are disallowed today.
The binary calendar reps are always treated with fixed length of 4 and 8
respectively, so no point in making them variable length.
All binary floats have length 4 and all binary doubles have length 8 so no
point in making them variable length.
I am ok with being conservative and continuing to disallow binaryNumberRep
'binary'. As you say we can open this up in future.
Same for binary booleans.
I agree that xs:hexBinary should be allowed to have lengthKind
'delimited'. It will be too restrictive to only allow BLOB data to have a
specified length, or to be bounded by parent. This is shown by IBM 4690
point-of-sale data streams which contain instances of variable length
delimited BLOBs.
If we are in agreement then we need to take an errata on section 12 and
particularly section 12.3.8 to allow xs:hexBinary to have lengthKind
'delimited'.
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
From: Mike Beckerle <mbeckerle.dfdl at gmail.com>
To: dfdl-wg at ogf.org
Date: 14/08/2012 19:44
Subject: [DFDL-WG] proposed clarification/narrowing - delimited
binary data should be decimal
Sent by: dfdl-wg-bounces at ogf.org
The spec allows lengthKind='delimited' for binary data.
For calendar types, it allows only 'bcd' and 'packed' binaryCalendarRep.
There is no such restriction for integer types, so those can also be
'binary' aka twos-complement.
We should be consistent. Either we allow binaryCalendarRep='binary', or we
disallow binaryNumberRep='binary'.
I propose we disallow binaryNumberRep='binary'. Rationale: conservative
choice. We could open it up later if there was reason to do so, but we
can't easily restrict it later if we find it problematic.
This leaves only hexBinary as the exception. Elements of type hexBinary
can have lengthKind='delimited', and the schema author simply has to
understand what byte pattern is usable as a delimiter.
--
Mike Beckerle | OGF DFDL WG Co-Chair
Tel: 781-330-0412
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Unless stated otherwise above:
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741598.
Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU
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741598.
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