<xsd:key> or <xsd:unique> - no xform support?

There doesn't appear to be any support for <xsd:key> or <xsd:unique> in Orbeon.
I need to establish a primary key in my element to ensure that a valid and unique key is entered.

Here is an excerpt from my schema:

primary key:

  <xs:key name="idisPK">
          <xs:selector xpath="student"/>
        <xs:field xpath="@id"/>
        </xs:key>

I've also tried just using the unique constraints to see if that works. But no luck.

Unique:
       <xs:unique name="studentIDisUnique">
                <xs:selector xpath="student"/>
                <xs:field xpath="@id"/>
        </xs:unique>
       

Any help?

We worked around this with some help from the Orbeon developers.  Please see here for the solution.

gino,

Your advice was excellent!

The previous post saved me days of frustration. I was able to make sure all my id attributes are unique by including the following line of code:

<xf:bind nodeset="//@id" constraint="for $current-id in . return count(//@id[. = $current-id]) = 1"/> 

My next two challenges are :

1) autoincrement an id when I create a new row

2) ensure that all keyref matches a key. that exists in another. potentially by a pulldown.