<!ELEMENT rss (channel)*>
<!ATTLIST rss version CDATA #IMPLIED>
<!ENTITY % contenu "title, description, link">
<!ELEMENT channel (%contenu;, lastBuildDate, item*)>
<!ATTLIST channel id ID #REQUIRED >
<!ELEMENT lastBuildDate (#PCDATA)>
<!ELEMENT item (%contenu;)>
<!ATTLIST item id ID #REQUIRED >
<!ELEMENT title (#PCDATA)>
<!ELEMENT description (#PCDATA)>
<!ELEMENT link (#PCDATA)>