Question

I would like to validate a XML file with a schema for that values in the same node can’t be repeated. It’s important the order of the signatures. My invalid XML is:

   <person>
      <name>Peter Petrelli</name>
      <subject1>Mathematics</subject1>
      <note1>8.5</note1>
      <subject2>Natural Science</subject2>
      <note2>4.5</note2>
      <subject3>Mathematics</subject3>
      <note3>7</note3>
   </person>
</school>

It’s not possible Mathematics is more than once.

How can i validate this with a XSD schema?

Thank you very much

Answer 1

With a more sensible design there would be no problem:

<person>
<name>Peter Petrelli</name>
<subject>
    <name>Mathematics</name>
    <note>2</note>
</subject>
<subject>
    <name>Natural Sciences</name>
    <note>2.5</note>
</subject>
<subject>
    <name>Mathematics</name>
    <note>4</note>
</subject>

then the <unique> definition inside the <person> element could be:

    <unique name="su">
        <selector xpath="subject" />
        <field xpath="name"/>
    </unique>