DTD çalışma örneği.

catalog.xml

<?xml version="1.0" encoding="utf-8" standalone="no" ?>
<!-- INSTEAD OF INNER DTD: <!DOCTYPE catalog SYSTEM "catalog.dtd"> -->
<!-- OR USE BOTH DECLARATIONS: <!DOCTYPE catalog SYSTEM "catalog.dtd"[ ... ]> -->
	<!DOCTYPE catalog [

    <!ENTITY % p "(#PCDATA)">
    <!ENTITY % img_ext SYSTEM "img_ext.ent">
    
    <!ELEMENT catalog (book*)>
    <!ATTLIST catalog id IDREFS #IMPLIED>
    <!ELEMENT book ( author, title, genre, price, publish_date, image+, img_ext?, description?, publisher?)>
    <!ATTLIST book id ID #REQUIRED>
    <!ATTLIST book primary_keyword NMTOKEN #IMPLIED>
    <!ELEMENT author (#PCDATA)>
    <!ATTLIST author id IDREF #IMPLIED>
    <!ELEMENT title (#PCDATA)>
    <!ELEMENT genre (#PCDATA)>
    <!ELEMENT price (#PCDATA)>
    <!ATTLIST price currency (USD | EUR) #IMPLIED>
    <!ELEMENT publish_date (#PCDATA)>
    <!ELEMENT image EMPTY>
    <!ATTLIST image id CDATA #REQUIRED>
    <!ATTLIST image src CDATA "/images/default.jpg">
    <!ATTLIST image title CDATA #IMPLIED>
    %img_ext;
    <!ELEMENT description ANY>
    <!ATTLIST description about CDATA #FIXED "book">
    <!ELEMENT publisher (#PCDATA | name | country)*>
      <!ELEMENT name (#PCDATA)>
      <!ELEMENT country (#PCDATA)>

    <!ENTITY pearson "Pearson Publish">
    <!ENTITY longman SYSTEM "long_pub.ent">
]>

<catalog>
  <book id="b_101" primary_keyword="xml">
  <!-- NOT VALID: <book id="b_101" primary_keyword="what is xml"> -->
    <author>Gambardella, Matthew</author>
    <title>XML Developer's Guide</title>
    <genre>Computer</genre>
    <price currency="USD">44.95</price>
    <publish_date>2000-10-01</publish_date>
    <image id="1" src="" />
    <image id="2" src="/images/xml_dev_gui.jpg" title="XML Developer's Guide" />
    <image id="3" src="" />
    <!-- NOT VALID: <image src="" /> -->
    <description about="book">
      An in-depth look at creating applications
      with XML.
    </description>
    <publisher>
      <name>O' Really</name>
      <country>USA</country>
    </publisher>
  </book>
  <book id="b_102">
    <author>Ralls, Kim</author>
    <title>Midnight Rain</title>
    <genre>Fantasy</genre>
    <price currency="EUR">5.95</price>
    <publish_date>2000-12-16</publish_date>
    <image id="1" src="" />
    <description about="book">
      A former architect battles corporate zombies,
      an evil sorceress, and her own childhood to become queen
      of the world.
    </description>
    <publisher>&pearson;</publisher>
  </book>
  <book id="b_103">
    <author>Corets, Eva</author>
    <title>Maeve Ascendant</title>
    <genre>Fantasy</genre>
    <price>5.95</price>
    <publish_date>2000-11-17</publish_date>
    <image id="1" src="" />
    <image id="2" src="" />
    <img_ext id="4" />
    <description>
      After the collapse of a nanotechnology
      society in England, the young survivors lay the
      foundation for a new society.
    </description>
    <publisher>
      &longman;
    </publisher>
  </book>
  <book id="b_104">
    <author>Corets, Eva</author>
    <title>Oberon's Legacy</title>
    <genre>Fantasy</genre>
    <price>5.95</price>
    <!-- NOT VALID: <price currency="TRY">5.95</price> -->
    <publish_date>2001-03-10</publish_date>
    <image id="1" src="" />
    <image id="2" src="" />
    <image id="3" src="" />
    <description>
      In post-apocalypse England, the mysterious
      agent known only as Oberon helps to create a new life
      for the inhabitants of London. Sequel to Maeve
      Ascendant.
    </description>
  </book>
  <book id="b_105">
    <author>Corets, Eva</author>
    <title>The Sundered Grail</title>
    <genre>Fantasy</genre>
    <price>5.95</price>
    <publish_date>2001-09-10</publish_date>
    <image id="1" src="" />
    <description>
      The two daughters of Maeve, half-sisters,
      battle one another for control of England. Sequel to
      Oberon's Legacy.
    </description>
  </book>
  <book id="b_106">
    <author>Randall, Cynthia</author>
    <title>Lover Birds</title>
    <genre>Romance</genre>
    <price>4.95</price>
    <publish_date>2000-09-02</publish_date>
    <image id="1" src="" />
    <description>
      When Carla meets Paul at an ornithology
      conference, tempers fly as feathers get ruffled.
    </description>
  </book>
  <book id="b_107">
    <author>Thurman, Paula</author>
    <title>Splish Splash</title>
    <genre>Romance</genre>
    <price>4.95</price>
    <publish_date>2000-11-02</publish_date>
    <image id="1" src="" />
    <image id="2" src="" />
    <description>
      A deep sea diver finds true love twenty
      thousand leagues beneath the sea.
    </description>
  </book>
  <book id="b_108">
    <author>Knorr, Stefan</author>
    <title>Creepy Crawlies</title>
    <genre>Horror</genre>
    <price>4.95</price>
    <publish_date>2000-12-06</publish_date>
    <image id="1" src="" />
    <image id="2" src="" />
    <image id="3" src="" />
    <description>
      An anthology of horror stories about roaches,
      centipedes, scorpions  and other insects.
    </description>
    <publisher>&pearson;</publisher>
  </book>
  <book id="b_109">
    <author>Kress, Peter</author>
    <title>Paradox Lost</title>
    <genre>Science Fiction</genre>
    <price>6.95</price>
    <publish_date>2000-11-02</publish_date>
    <image id="1" src="" />
    <image id="2" src="" />
    <image id="3" src="" />
    <description>
      After an inadvertant trip through a Heisenberg
      Uncertainty Device, James Salway discovers the problems
      of being quantum.
    </description>
  </book>
  <book id="b_110">
    <author>O'Brien, Tim</author>
    <title>Microsoft .NET: The Programming Bible</title>
    <genre>Computer</genre>
    <price>36.95</price>
    <publish_date>2000-12-09</publish_date>
    <image id="1" src="" />
    <description>
      Microsoft's .NET initiative is explored in
      detail in this deep programmer's reference.
    </description>
  </book>
  <book id="b_111">
    <author>O'Brien, Tim</author>
    <title>MSXML3: A Comprehensive Guide</title>
    <genre>Computer</genre>
    <price>36.95</price>
    <publish_date>2000-12-01</publish_date>
    <image id="1" src="" />
    <image id="2" src="" />
    <description>
      The Microsoft MSXML3 parser is covered in
      detail, with attention to XML DOM interfaces, XSLT processing,
      SAX and more.
    </description>
  </book>
  <book id="b_112">
    <author>Galos, Mike</author>
    <title>Visual Studio 7: A Comprehensive Guide</title>
    <genre>Computer</genre>
    <price>49.95</price>
    <publish_date>2001-04-16</publish_date>
    <image id="1" src="" />
    <description>
      Microsoft Visual Studio 7 is explored in depth,
      looking at how Visual Basic, Visual C++, C#, and ASP+ are
      integrated into a comprehensive development
      environment.
    </description>
    <publisher>&pearson;</publisher>
  </book>
</catalog>