<!ELEMENT content EMPTY >
<!ATTLIST content src CDATA #REQUIRED >

<!ELEMENT docTitle ( text ) >

<!ELEMENT head ( meta+ ) >

<!ELEMENT meta EMPTY >
<!ATTLIST meta content CDATA #REQUIRED >
<!ATTLIST meta name NMTOKEN #REQUIRED >

<!ELEMENT navLabel ( text ) >

<!ELEMENT navMap ( navPoint+ ) >

<!ELEMENT navPoint ( navLabel, content, navPoint* ) >
<!ATTLIST navPoint id ID #REQUIRED >
<!ATTLIST navPoint playOrder NMTOKEN #REQUIRED >

<!ELEMENT ncx ( head, docTitle, navMap, pageList ) >
<!ATTLIST ncx version NMTOKEN #REQUIRED >
<!ATTLIST ncx xml:lang NMTOKEN #REQUIRED >
<!ATTLIST ncx xmlns CDATA #REQUIRED >

<!ELEMENT pageList ( navLabel, pageTarget+ ) >
<!ATTLIST pageList class NMTOKEN #REQUIRED >
<!ATTLIST pageList id NMTOKEN #REQUIRED >

<!ELEMENT pageTarget ( navLabel, content ) >
<!ATTLIST pageTarget id ID #REQUIRED >
<!ATTLIST pageTarget playOrder NMTOKEN #REQUIRED >
<!ATTLIST pageTarget type ( front | normal ) #REQUIRED >
<!ATTLIST pageTarget value NMTOKEN #REQUIRED >

<!ELEMENT text ( #PCDATA ) >