例7－3.txt

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<? xml version = "1.0" ?>
<! DOCTYPE INVENTORY 
[
<! ELEMENT INVENTORY (BOOK | CD) *>
<! ENTITY  % book _ decls SYSTEM " ch7-3-Book.dtd">
<! ENTITY  % cd_decls SYSTEM "ch7-3-CD.dtd">
%book_decls;
%cd_decls;
]
>
<INVENTORY>
  <BOOK>
     <BOOKTITLE> The Marble Faun </BOOKTITLE>
     <AUTHOR> Nathaniel Hawthorne </ AUTHOR>
     <PAGES> 473 </PAGES>
  </BOOK>
  <CD>
     <CDTITLE> Concerti Grossi Opus 3 </ CDTITLE>
     <COMPOSER > Handel </ COMPOSER>
     <LENGTH> 72 minutes </ LENGTH>
  </CD>
  <BOOK>
     <BOOKTITLE> Leaves of Grass </ BOOKTITLE>
     <AUTHOR> Walt Whitman </AUTHOR>
     <PAGES > 462 </PAGES>
  </BOOK>
<!--additional items … -->
</ INVENTORY>
ch7-3-Book.dtd实体文件的内容如下：
<! ELEMENT BOOK (BOOKTILE, AUTHOR, PAGES)
<! ELEMENT BOOKTITLE (#PCDATA)>
<! ELEMENT AUTHOR (# PCDATA)>
<! ELEMENT PAGES (# PCDATA)>
ch7-3-CD.dtd实体文件的内容如下：
<! ELEMENT CD (CDTITLE, COMPOSER, LENGTH)>
<! ELEMENT CDTITLE (# PCDATA)>
<! ELEMENT COMPOSER (# PCDATA)>
<! ELEMENT LENGTH (#PCDATA)>