1  <!DOCTYPE doc [
 2  <!ELEMENT doc (#PCDATA | ns:a | ns:b)*>
 3  <!ATTLIST doc
 4            attr  CDATA #REQUIRED
 5            xmlns:ns CDATA #IMPLIED>
 6  <!ELEMENT a EMPTY>
 7  <!ELEMENT b (#PCDATA)>
 8  ]>
 9  <ns:doc ns:attr="val" xmlns:ns="http://www.example.org/test/">
10     <ns:a/>
11     <ns:b>first line</ns:b>
12     <ns:b>second line</ns:b>
13  </ns:doc>