tag-value should be unique ...

[ankur rathi]

Hi ,
I have this XML file :

 
<customers>
  <customer>
    <id>1</id>
    <name>bill</name>
  </customer>
  <customer>
    <id>2</id>
    <name>bill</name>
  </customer>
<customers>  
 

And I need to force that id should be unique for customers . can I do by schema . Can you please mention what I have to write in schema for this requirement ...

Thanks a lot .

[Madhav Lakkapragada]

Originally posted by rathi ji:
And I need to force that id should be unique for customers . can I do by schema . Can you please mention what I have to write in schema for this requirement ...

Yes you can. But if I were to write the schema I would make it an attribute instead of an element by itself. That's just me. From what you are describing, this seems like a property of the customer element. Hence, an attribute.

- m

[ankur rathi]

That is OK Madhav ,
But how can we do that , can you or anybody tell me ....

Thanks a lot .

[Hasan Pasha]

Here we go...
Try to add the max and min limit for N2 and N1 in the schema.

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
   elementFormDefault="qualified"
   attributeFormDefault="unqualified">
 
  <xs:element name="customers">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="customer" minOccurs="0" maxOccurs="unbounded"/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
 
  <xs:element name="customer">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="id" />
        <xs:element name="name" type="xs:string" />
      </xs:sequence>
    </xs:complexType>
  </xs:element>
 
  <xs:element name="id">
    <xs:simpleType>
      <xs:restriction base="xs:integer">
        <xs:minInclusive value="N1" />
        <xs:maxInclusive value="N2" />
      </xs:restriction>
    </xs:simpleType>
  </xs:element>

Dont get offended if I ask you a question...
Dint you come across such a requirement while preparing for the IBM test 141?

[Hasan Pasha]

I am sorry... I got your requirement wrong.
Will get back to you if I get a solution.

[Hasan Pasha]

Please take a look at the usage of xsd:unique element.

[Hasan Pasha]

This schema, I am sure will address your problem.

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified">
  <xs:element name="customers">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="customer" minOccurs="0" maxOccurs="unbounded"/>
      </xs:sequence>
    </xs:complexType>
[B]
    <xs:unique name="customerId">
      <xs:selector xpath="./customer"/>
      <xs:field xpath="id"/>
    </xs:unique>
[/B]
  </xs:element>
  <xs:element name="customer">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="id" type="xs :-P	 ositiveInteger"/>
        <xs:element name="name" type="xs:string"/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
</xs:schema>