下面的文档是cds.xml用到的cds.dtd。
<! ELEMENT compactdiscs (compactdisc*)>
<! ELEMENT compactdisc (artist, title, tracks, price)>
<! ENTITY % Type "individual | band">
<! ELEMENT artist (#PCDATA)>
<! ATTLIST artist type (%Type;) #REQUIRED>
<! ELEMENT title (#PCDATA)>
<! ATTLIST title numberoftracks CDATA #REQUIRED>
<! ELEMENT tracks (track*)>
<! ELEMENT price (#PCDATA)>
<!ELEMENT track (#PCDATA)>
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