xsd:unique - validate attriubte value for whole

[Miguel Isidoro]

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
<Responseelements inside the same <Questionelement, not at the whole
document level as I want. Is there any way to achieve this?

Thanks
Miguel

[Martin Honnen]

Miguel Isidoro wrote:

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
<Responseelements inside the same <Questionelement, 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).
--

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

[Miguel Isidoro]

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
"Martin Honnen" wrote:

>

Miguel Isidoro wrote:

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
<Responseelements inside the same <Questionelement, 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).
--

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