<!ELEMENT genetics_home_reference_topic_list ( title, url, publisher, rights, topic* )>
<!ELEMENT title     (#PCDATA)>
<!ELEMENT url       (#PCDATA)>
<!ELEMENT publisher (#PCDATA)>
<!ELEMENT rights    (#PCDATA)>
<!ELEMENT topic     ( title, url, topics? )> 
<!ELEMENT topics    ( topic* )> 

<!ATTLIST topic id  CDATA #IMPLIED>