Possibly a small error an XRD Schema.

In reading over the document to write up a blog post, I noticed that in
section 6 talking about creating an XRD Sequence the schema contains:

     <element ref="xrd:XRD" minOccurs="0" maxOccurs="unbounded"/>

Shouldn't that be:

     <element ref="xrd:XRD" minOccurs="1" maxOccurs="unbounded"/>

Sorry for catching this late.

Nika