[DDI-users] DDI 3.2: Schema allows double identification sequence

[Wendy Thomas]

Yes we know about this but have been unable in XML to allow only one of
each but require at least one or the other. We have had the bug filed since
version 3.0. The best we could do was document what was supposed to be
done.

URL OR sequence OR both is the intention and so documented.

However 2 URLs or 2 sequences will validate in the XML

Wendy


On Wed, Dec 3, 2014 at 4:16 PM, Jani Hautamäki <Jani.Hautamaki at staff.uta.fi>
wrote:

>  In DDI-Lifecycle 3.2 the narrative documentation
>
>
> http://www.ddialliance.org/Specification/DDI-Lifecycle/3.2/XMLSchema/FieldLevelDocumentation/schemas/reusable_xsd/complexTypes/AbstractIdentifiableType.html
>
> for the type
>
> {ddi:reusable:3_2}AbstractIdentifiableType
>
> states that
>
> "An entity can either be identified either by a URN and/or an
> identification
> sequence. At a minimum, one or the other is required. "
>
> However, according to the XML Schema, the following XML document is valid.
>
> ---8<---8<---8<---
> <?xml version="1.0" encoding="utf-8"?>
> <ddi:DDIInstance
>     xmlns:ddi="ddi:instance:3_2"
>     xmlns:r="ddi:reusable:3_2"
>     >
>
>   <r:Agency>acme.org</r:Agency>
>   <r:ID>ddi_instance</r:ID>
>   <r:Version>1</r:Version>
>
>   <r:Agency>acme.org</r:Agency>
>   <r:ID>another_ddi_instance</r:ID>
>   <r:Version>2</r:Version>
>
> </ddi:DDIInstance>
> ---8<---8<---8<---
>
> This is invalid according to specification, but the restriction
> is not expressed formally with XML Schema.
>
> My question is then:
>
> Is this a mistake/bug in the XML Schema? (If not, please explain why
> it is better to formally allow such invalid documents?)
>
> The XML Schema language allows one to express formally the restriction
> "either one or both". The details are laid down, for instance, in the
> answer
> http://stackoverflow.com/questions/9863056/xsd-schema-either-one-or-both
>
> Here's a patch for the file "reusable.xsd" that is included in the current
> distribution package of the DDI-Lifecycle 3.2:
>
>
>  http://www.pastebucket.com/72481
>
>
>
>
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>
>


-- 
Wendy L. Thomas                              Phone: +1 612.624.4389
Data Access Core Director                 Fax:   +1 612.626.8375
Minnesota Population Center             Email: wlt at umn.edu
University of Minnesota
50 Willey Hall
225 19th Avenue South
Minneapolis, MN 55455
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