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<!-- The following DTD is a simple view of a book:
book
index
+
word
#PCDATA
page
#PCDATA
chapter+
comment?
#PCDATA
paragraph*
#PCDATA
summary?
#PCDATA
good
EMPTY
-->
<!ELEMENT summary (#PCDATA)>
<!ELEMENT book (index+, chapter+, summary?, good, available, extra)>
<!ELEMENT good EMPTY>
<!ELEMENT available EMPTY>
<!ELEMENT index (word, ref+)>
<!ELEMENT ref (page, line)>
<!ELEMENT word (#PCDATA)>
<!ELEMENT line (#PCDATA)>
<!ELEMENT page (#PCDATA)>
<!ELEMENT chapter (comment?, paragraph*, comment?)>
<!ATTLIST chapter length CDATA #IMPLIED >
<!ELEMENT paragraph (#PCDATA)>
<!ELEMENT comment (#PCDATA)>
<!ELEMENT extra ((size-cm | size-inches | size), color?, (weight-lb | weight-kg))>
<!ELEMENT size-cm (#PCDATA)>
<!ELEMENT size-inches (#PCDATA)>
<!ELEMENT size (#PCDATA)>
<!ELEMENT color (#PCDATA)>
<!ELEMENT weight-lb (#PCDATA)>
<!ELEMENT weight-kg (#PCDATA)>
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