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<!ELEMENT book (title?, chapter+, note?, paperback?, summary?, isbn?, price?)>
<!ELEMENT title (#PCDATA)>
<!ELEMENT chapter (title, summary?, paragraph*, conclusion?, ending?)>
<!ELEMENT note ((year | date), copyright)>
<!ELEMENT year (#PCDATA)>
<!ELEMENT date (#PCDATA)>
<!ELEMENT copyright (#PCDATA)>
<!ELEMENT summary (#PCDATA)>
<!ELEMENT price (#PCDATA)>
<!ELEMENT isbn (#PCDATA)>
<!ELEMENT conclusion (#PCDATA)>
<!ELEMENT ending (#PCDATA)>
<!ELEMENT paragraph (#PCDATA)>
<!ELEMENT paperback EMPTY>
<!ATTLIST book instock (yes | no) "yes">
<!ATTLIST title lang CDATA #FIXED "en">
<!ATTLIST chapter length CDATA #IMPLIED>
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