I'm looking to define a particular kind of recursive XML Schema. It needs to 
describe the following kind of document:

<nodes>
  <node>
    <name>Node 1</name>
    <item/>
  </node>
  <node>
    <name>Node 2</name>
    <nodes>
      <node>
        <item/>
        <name>Node 4</name>
      </node>
    </nodes>
  </node>
  <node>
    <name>Node 3</name>
    <item/>
  </node>
</nodes>

Key features of this document are:

1) nodes/node nesting can be to any (reasonable) depth.
2) All "node" elements must contain "a name elements " AND ("a nodes 
elements " OR "an item elements "). Or, to put it another way, it should not 
contain both a "node" and "item", but must have one of them - in addtion to 
the name element, which it also must have.
3). "name" elements can come before or after the "nodes" or "item" element 
(e.g. be in an xs:all compositor.

Where I'm really struggling is in how to get the name and nodes OR items. 
Looks like I need an xs:all with an xs:choice underneath it, but that 
doesn't seem to be allowed.

Help?