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MODS  October 2011

MODS October 2011

Subject:

Re: xlink namespace in MODS schema

From:

Jens Østergaard Petersen <[log in to unmask]>

Reply-To:

Metadata Object Description Schema List <[log in to unmask]>

Date:

Wed, 12 Oct 2011 11:35:21 +0200

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (143 lines)

Hi Ray,

Your document validates with me as well, because the MODS schema references the XLink schema at <http://www.loc.gov/standards/xlink/xlink.xsd>. 

My point was that the Library of Congress XLink schema does not accord with the W3C XLink schema in the naming of simpleLink/simpleAttrs, so if you change the schemaLocation for the XLink schema in the MODS schema and substitute it with a reference to the standard XLink schema at <http://www.w3.org/1999/xlink.xsd>, your document becomes invalid.

Since I don't have XMLSpy and you don't have oXygen, let us discuss from <http://validate.openlaboratory.net/>. With the Library of Congress XLink schema your document validates nicely, but with the W3C XLink schema, it gives:

Errors detected:
Error at file "mods.xsd", line 441, column 241
   Message: attributeGroup 'http://www.w3.org/1999/xlink:simpleLink' not found
Error at file "mods.xsd", line 146, column 157
   Message: attributeGroup 'http://www.w3.org/1999/xlink:simpleLink' not found
Error at file "mods.xsd", line 526, column 207
   Message: attributeGroup 'http://www.w3.org/1999/xlink:simpleLink' not found
Error at file "mods.xsd", line 550, column 215
   Message: attributeGroup 'http://www.w3.org/1999/xlink:simpleLink' not found
Error at file "mods.xsd", line 258, column 314
   Message: attributeGroup 'http://www.w3.org/1999/xlink:simpleLink' not found
Error at file "Untitled1.xml", line 8, column 39
   Message: attribute '{http://www.w3.org/1999/xlink}href' is not declared for element 'abstract'

<http://xmltools.corefiling.com/schemaValidate/> gives the same result. So does Oxygen and I assume that so does XMLSpy.

Thank you for your offer to look at my files, but after my confusion about what oXygen defaults to in the case that no schemaLocation is present in the base schema was cleared up, I have no issues with validating MODS records. Thank you for your patience.

My concern was solely that the Library of Congress XLink schema had gotten out of touch with the W3C Xlink schema.

Best,

Jens

On Oct 11, 2011, at 3:50 PM, Ray Denenberg, Library of Congress wrote:

> Jens -  can you send me the file that doesn't validate.
> 
> The following validates with XMLSpy
> 
> _____________________________________
> <mods 
> 
>      xmlns="http://www.loc.gov/mods/v3" 
>      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
>      xsi:schemaLocation="http://www.loc.gov/mods/v3 mods-3-4.xsd" 
>      xmlns:xlink="http://www.w3.org/1999/xlink">
> 
> <abstract  xlink:href="http:xxx"/>
> 
> </mods>
> ____________________________________
> 
> 
> (I have a minor temporary problem with my Oxygen license, and I would like
> look at your file with XMLSpy before I pursue the license problem.)
> 
> --Ray
> 
> 
> 
>> -----Original Message-----
>> From: Metadata Object Description Schema List
>> [mailto:[log in to unmask]] On Behalf Of Jens Østergaard Petersen
>> Sent: Tuesday, October 11, 2011 2:33 AM
>> To: [log in to unmask]
>> Subject: Re: [MODS] xlink namespace in MODS schema
>> 
>> Hello Ray,
>> 
>> Sorry for casting aspersions on Saxon …. it turned out that an outdated
>> XLink schema included with oXygen was the culprit.
>> 
>> <http://www.oxygenxml.com/pipermail/oxygen-user/2011-
>> October/003867.html>
>> 
>> However, there remains a small issue.
>> 
>> The MODS XLink schema <http://www.loc.gov/standards/xlink/xlink.xsd> is
>> derived from (identical to) the METS XLink schema. This schema maps the
>> namespace to "http://www.w3.org/1999/xlink". Most naturally, this would
>> refer to <http://www.w3.org/1999/xlink.xsd> (which is identical in
>> substance to <http://www.w3.org/XML/2008/06/xlink.xsd>), however, what
>> Library of Congress calls "simpleLink", W3C here calls "simpleAttrs" -
>> "simpleLink" comes from <http://www.w3.org/TR/xlink/>. This means that
>> a valid MODS record employing @xlink:href does not validate against the
>> current XLink schema.
>> 
>> I have not looked for any other differences.
>> 
>> Best,
>> 
>> Jens
>> 
>> On Oct 7, 2011, at 2:33 PM, Jens Østergaard Petersen wrote:
>> 
>>> Hello Ray,
>>> 
>>> Thank you for answering so quickly.
>>> 
>>> It appears to be the case that my problem is connected to a possible
>>> bug in how Saxon validates; see
>>> 
>>> <http://www.oxygenxml.com/pipermail/oxygen-user/2011-
>> October/003865.ht
>>> ml>
>>> <http://www.oxygenxml.com/pipermail/oxygen-user/2011-
>> October/003866.ht
>>> ml>
>>> 
>>> Sorry for the static! I think it is often the case that formulating a
>> question on a mailing list leads to a more systematic investigation of
>> possible answers - which then renders the question unnecessary ….
>>> 
>>> Best,
>>> 
>>> Jens
>>> 
>>> On Oct 6, 2011, at 3:18 PM, Ray Denenberg, Library of Congress wrote:
>>> 
>>>> Could you send me the XML file please.  --Ray
>>>> 
>>>>> -----Original Message-----
>>>>> From: Metadata Object Description Schema List
>>>>> [mailto:[log in to unmask]] On Behalf Of Jens Østergaard
>> Petersen
>>>>> Sent: Thursday, October 06, 2011 4:25 AM
>>>>> To: [log in to unmask]
>>>>> Subject: [MODS] xlink namespace in MODS schema
>>>>> 
>>>>> Hello,
>>>>> 
>>>>> I am probably just missing something obvious, but how do I redefine
>>>>> the MODS 3.4 schema to make use of @xlink:href valid?
>>>>> 
>>>>> Engine name: Saxon-EE 9.3.0.5
>>>>> Severity: fatal
>>>>> Description: The attributeGroup {simpleLink} is referenced, but has
>>>>> not been declared
>>>>> 
>>>>> Best,
>>>>> 
>>>>> Jens=
>>> 

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