XML Schema for sequence of elements with same name but different attribute values?

Question

How can I specify an XML schema for an instance document like this:

Answer 1

You could try something like this - create a separate complexType for your "informationSet" elements, and limit the attribute to a list of valid strings:

Of course, you can extend that list of valid attribute names if you wish - just add more elements to the restriction-enumeration list there.

Marc