1<!DOCTYPE doc [
2<!ATTLIST e2 xml:space (default|preserve) 'preserve'>
3<!ATTLIST e3 id ID #IMPLIED>
4]>
5<doc xmlns="http://www.ietf.org" xmlns:w3c="http://www.w3.org" xml:base="something/else">
6   <e1>
7      <e2 xmlns="" xml:id="abc" xml:base="bar/">
8         <e3 id="E3" xml:base="foo"/>
9      </e2>
10   </e1>
11</doc>
12