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<!-- The following DTD is a simple view of a book:
Tree:
book
title
#PCDATA
index*
word
#PCDATA
ref+
page
#PCDATA
line
#PCDATA
chapter+
number
#PCDATA
comment?
#PCDATA
paragraph*
#PCDATA
summary?
#PCDATA
instock
EMPTY
-->
<!ELEMENT book (title, author+, index*, chapter+, summary?, instock, content)>
<!ELEMENT content (title, comment)>
<!ELEMENT title (#PCDATA)>
<!ELEMENT author (#PCDATA)>
<!ELEMENT summary (#PCDATA)>
<!ELEMENT instock EMPTY>
<!ELEMENT index (word, ref+)>
<!ELEMENT ref (page, line)>
<!ELEMENT word (#PCDATA)>
<!ELEMENT line (#PCDATA)>
<!ELEMENT page (#PCDATA)>
<!ELEMENT chapter (number, comment?, paragraph*)>
<!ELEMENT number (#PCDATA)>
<!ELEMENT paragraph (#PCDATA)>
<!ELEMENT comment (#PCDATA)>
<!ATTLIST book good (yes, no) "yes">
<!ATTLIST summary length CDATA #REQUIRED>
<!ATTLIST summary lang CDATA #IMPLIED>
<!ATTLIST paragraph opt CDATA #IMPLIED>
<!ATTLIST summary size CDATA #FIXED "12">
<!ATTLIST chapter title CDATA #IMPLIED>
<!ATTLIST index color CDATA #IMPLIED>
<!ATTLIST index cross-ref (yes no) "no">
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