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