<?xml version="1.0" encoding="utf-8" ?>
<schema targetNamespace="http://www.w3.org/XML/1998/namespace" xmlns="http://www.w3.org/2001/XMLSchema" xml:lang="en">

 <attribute name="space" default="preserve">
  <simpleType>
   <restriction base="NCName">
    <enumeration value="default"/>
    <enumeration value="preserve"/>
   </restriction>
  </simpleType>
 </attribute>

</schema>