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

[Wendy Thomas]

Thanks Jani,

I looked at this late at night. I'll put this in the issue tracker and we
will look at it for 3.3. Sorry for the misreading.

Wendy

On Wed, Dec 3, 2014 at 4:58 PM, Jani Hautamäki <Jani.Hautamaki at staff.uta.fi>
wrote:

>  From what you said I get the impression that it is a bug in the XML
> Schema. Intension is expressed in the specifcation, but incapable of
> formulating the restriction in XML Schema. Is this correct?
>
>
>  The patch was included in the message and the resulting .xsd was tested
> against libxml2 v2.7.8. The patched schema worked just as intended.
> Including the patch in the XML Schema would reduce the number of documents
> that formally valid but invalid according to the specification.
>
>
>  Of course, accepting the fix to the schema would imply that also the
> similar structure in the ReferenceType should be fixed in a similar manner.
> However, in my opinion, this would only be a good thing to happen...
>
>
>  ------------------------------
> *From:* ddi-users-bounces at icpsr.umich.edu <
> ddi-users-bounces at icpsr.umich.edu> on behalf of Wendy Thomas <wlt at umn.edu>
> *Sent:* Thursday, December 4, 2014 00:27
> *To:* Data Documentation Initiative Users Group
> *Subject:* Re: [DDI-users] DDI 3.2: Schema allows double identification
> sequence
>
>  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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>
>


-- 
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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