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>