Documento correcto autocontenido
<?xml version="1.0" standalone="yes"?>
<!DOCTYPE EXAMPLE [
<!ELEMENT EXAMPLE (TITLE,PARA+)>
<!ELEMENT TITLE (#PCDATA)>
<!ELEMENT PARA (#PCDATA|KEYWORD)*>
<!ELEMENT KEYWORD (#PCDATA)>
]>
<EXAMPLE>
<TITLE>A valid XML document</TITLE>
<PARA>These twelve lines comprise a <KEYWORD>well-formed</KEYWORD> and
<KEYWORD>valid</KEYWORD> XML document.</PARA>
</EXAMPLE>