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<!DOCTYPE book [
<!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 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"> 
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]>

<book> 
<chapter> 
<title>The sand castle</title> 
<paragraph> 
Once upon a time, on a far sunny island, ... 
</paragraph> 
</chapter> 
</book>