1<?xml version="1.0"?>
2<!DOCTYPE a [
3<!ELEMENT a (#PCDATA | b | s:b)*>
4<!ATTLIST a xmlns:s CDATA #IMPLIED>
5<!ELEMENT b EMPTY>
6<!ATTLIST b xmlns:s CDATA #IMPLIED>
7<!ELEMENT s:b EMPTY>
8<!ATTLIST s:b xmlns:s CDATA #IMPLIED>
9]>
10<a xmlns:s="http://some.test.ns/a">
11  Some text.
12	<b/>
13  Some text.
14	<s:b/>
15  Some text.
16</a>
17