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<h2><font color="#009999">Chapter Summary</font></h2>
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<li>A DOMDocument object consists of nodes that are represented by objects of
the DOMNode class or one of its derived classes. The most important derived
classes are DOMElement and DOMText</li>
<li>A DTD is a sequence of rules that describe the legal child elements and
attributes for each element type. An XML document can contain its DTD or
refer to a DTD that is stored elsewhere. When referencing an external DTD,
you must supply a file name or URL</li>
<li>It is best to use DTDs with XML files. When using DTDs, you should tell
the parser to validate the document and to ignore white space. This greatly
simplifies the implementation of the parser functions</li>
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