Question

I have an XML file:

<tasks>
    <task name="task-12">
        <step>Open folder</step>
        <step nextTask="task-14">Delete contents.</step>
    </task>
    <task name="task-13">
        <step nextTask="task-16">Create new folder folder</step>
    </task>
    <task name="task-14">
        <step>Move files into folder.</step>
    </task>
</tasks>

How would I go about specifying in an XSD that the step/@nextTask value is only valid if it matches a value of a task/@name.

i.e. In the above example, the step of task-13 would be considered invalid?

Answer 1

Easiest way: declare the task name attribute to be of type xsd:ID and the step nextTask attribute to be of type xsd:IDREF.