xsd:unique - validate attriubte value for whole

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Miguel Isidoro - 27 Jul 2006 16:19 GMT

Hi all,

I am trying to include a xsd:unique element in my schema to make an
attribute of an element unique at the whole document level.

Consider the following xml fragment:

<Form>
<Question>
<Response id="response1">
</Response>
<Response id="response1">
</Response>
</Question>
<Question>
<Response id="response1">
</Response>
</Question>
</Form>

Here is a fragment of my schema:

<xs:complexType name="Question">
<xs:sequence>
<xs:element minOccurs="0" name="Response" type="Response">
</xs:element>
<xs:unique name="questionResponseNameUnique">
<xs:selector xpath="Response" />
<xs:field xpath="@id" />
</xs:unique>

The problem with my schema is that it only validates the duplicate id
<Response> elements inside the same <Question> element, not at the whole
document level as I want. Is there any way to achieve this?

Thanks
Miguel

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Martin Honnen - 27 Jul 2006 19:06 GMT

> I am trying to include a xsd:unique element in my schema to make an
> attribute of an element unique at the whole document level.

> The problem with my schema is that it only validates the duplicate id
> <Response> elements inside the same <Question> element, not at the whole
> document level as I want. Is there any way to achieve this?

Why don't you simply type that attribute as type xs:ID?

If you want to use the xs:unique element then you need to put it in the
definition of the root element (e.g. the Form element).

Signature

Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/

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Miguel Isidoro - 28 Jul 2006 11:06 GMT

Problem solved. Thanks for the tip. I had already tried that but with the
wrong syntax. Here is the example I have:

<xs:key name="responseNameKey">
            <xs:selector xpath="./QuestionList/Question/ResponseList/Response |
./QuestionList/Question/ResponseList/Response/ResponseOptions/ResponseOption

./QuestionList/Question/QuestionGroupList/QuestionGroup/ResponseList/Response

./QuestionList/Question/QuestionGroupList/QuestionGroup/ResponseList/Response/ResponseOptions/ResponseOption

./QuestionList/Question/QuestionGroupList/QuestionGroup/QuestionList/Question/ResponseList/Response

./QuestionList/Question/QuestionGroupList/QuestionGroup/QuestionList/Question/ResponseList/Response/ResponseOptions/ResponseOption" />
            <xs:field xpath="@name" />
        </xs:key>

It is this complicated because not all elements have an attribute that
should be considered an unique key, so I enumerated the elements that have
the attribute that can't be repeated. I included this schema fragment at the
root level.

Tnanks a lot
Miguel

> > I am trying to include a xsd:unique element in my schema to make an
> > attribute of an element unique at the whole document level.
[quoted text clipped - 7 lines]
> If you want to use the xs:unique element then you need to put it in the
> definition of the root element (e.g. the Form element).

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xsd:unique - validate attriubte value for whole

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