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Re: key and keyref issues

  • From: "Ghislain Fourny" <gfourny@inf.ethz.ch>
  • To: John Dziurlaj <john@hiltonroscoe.com>
  • Date: Wed, 30 May 2018 16:11:01 +0000

Re:  key and keyref issues
Dear John,

I found the original documents -- your first e-mail with them got stuck in the spam filter, apologies about the overhead.

The reason why the default namespace is not considered is that, in my understanding, XML Schema uses restricted XPath, based on XPath 1.0.

In XPath 1.0, you can see that node tests do not consider default namespaces, i.e., the absence of prefix always means no namespace, see here:


I hope this helps.

Kind regards,

> On 30 May 2018, at 17:58, John Dziurlaj <john@hiltonroscoe.com> wrote:
> I added an explicit namespace (n1) and updated the constraints to use it:
> New xsd:schema tag:
> <xsd:schema xmlns="NIST_V2_election_results_reporting.xsd"
> xmlns:xsd="http://www.w3.org/2001/XMLSchema"
> xmlns:n1="NIST_V2_election_results_reporting.xsd"
> targetNamespace="NIST_V2_election_results_reporting.xsd"
> elementFormDefault="qualified" version="2.0">
> New constraints:
> <xsd:key name="personKey">
> 	<xsd:selector xpath="./n1:Person"/>
> 	<xsd:field xpath="@ObjectId"/>
> </xsd:key>
> <xsd:keyref name="personKeyRef" refer="personKey">
> 	<xsd:selector xpath="./n1:Election/n1:Candidate"/>
> 	<xsd:field xpath="n1:PersonId"/>
> </xsd:keyref>
> And now the validation works as expected. I must say I'm not sure why I need
> the namespace, when I'm not using it anywhere else in the XSD.
> Thanks,
> John.
> -----Original Message-----
> From: Ghislain Fourny <gfourny@inf.ethz.ch>
> Sent: Wednesday, May 30, 2018 11:52 AM
> To: Michael Kay <mike@saxonica.com>
> Cc: John Dziurlaj <john@hiltonroscoe.com>; xml-dev@l...; Sam Dana
> <s.dana@prometheuscomputing.com>
> Subject: Re:  key and keyref issues
> Dear John,
> I agree with Mike -- however I also do see that in your document you are
> referring to types using no prefixes either, which may indicate that you are
> declaring a default namespace.
> Maybe if you would share your entire document, it would help narrow down the
> issue, or at least all the attributes and xmlns/targetNamespace bindings,
> usually all at the xsd:schema element.
> Thanks and kind regards,
> Ghislain
>> On 30 May 2018, at 17:41, Michael Kay <mike@saxonica.com> wrote:
>> The elements in the source document are all in a namespace but the path
>> expressions in your key definitions are looking for elements in no
>> namespace.
>> Michael Kay
>> Saxonica
>>> On 30 May 2018, at 16:33, John Dziurlaj <john@hiltonroscoe.com> wrote:
>>> I’m attempting to constrain a schema, which has a lot of xsd:ID and
>>> xsd:IDREF, so that, for example, a Person IDREF can only refer to a
>>> Person ID.
>>> I wrote a key and keyref constraint thus:
>>> <xsd:element name="ElectionReport" type="ElectionReport">
>>>      <xsd:key name="personKey">
>>>           <xsd:selector xpath="./Person"/>
>>>           <xsd:field xpath="@ObjectId"/>
>>>      </xsd:key>
>>>      <xsd:keyref name="personKeyRef" refer="personKey">
>>>           <xsd:selector xpath="./Election/Candidate"/>
>>>           <xsd:field xpath="PersonId"/>
>>>      </xsd:keyref>
>>> </xsd:element>
>>> However, when I try it against an example I wrote up (which should throw
>>> a validation error), it succeeds with no errors.
>>> I’ve attached both my schema and example file. I am using XMLSpy to
>>> validate my instances.
>>> Thanks,
>>> John Dziurlaj
>>> Elections Consultant
>>> Hilton Roscoe LLC
>>> Cell 330-714-8935 Work/Fax 234-706-6434
>>> <idc_test.xml><NIST_V2_election_results_reporting.xsd>_______________
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