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 <h1 class="topictitle1">Document type definitions (DTDs) - overview</h1>


 <div><p>A document type definition (DTD) provides you with the means to
 validate XML files against a set of rules. When you create a DTD file, you
 can specify rules that control the structure of any XML files that reference
 the DTD file.</p>

 <p>A DTD can contain declarations that define elements, attributes, notations,
 and entities for any XML files that reference the DTD file. It also establishes
 constraints for how each element, attribute, notation, and entity can be used
 within any of the XML files that reference the DTD file.</p>

 <p>To be considered a valid XML file, the document must be accompanied by
 a DTD (or an XML schema), and conform to all of the declarations in the DTD
 (or XML schema).</p>

 <p>Certain XML parsers have the ability to read DTDs and check to see if the
 XML file it is reading follows all of those rules. While the parser is reading
 the XML file, it will check each line to be sure that it conforms to the rules
 that are laid out in the DTD file. If there is a problem, the parser generates
 an error and points to where the error occurs in the XML file. This kind of
 parser is called a validating parser because it validates the content of the
 XML file against the DTD.</p>

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 <div class="familylinks">
 <div class="parentlink"><strong>Parent topic:</strong> <a href="../topics/tcretdtd.html" title="A document type definition (DTD) contains a set of rules that can be used to validate an XML file. After you have created a DTD, you can edit it manually, adding declarations that define elements, attributes, entities, and notations, and how they can be used for any XML files that reference the DTD file.">Creating DTDs</a></div>
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	<h1 class="topictitle1">Document type definitions (DTDs) - overview</h1>




	<div><p>A document type definition (DTD) provides you with the means to
	validate XML files against a set of rules. When you create a DTD file, you
	can specify rules that control the structure of any XML files that reference
	the DTD file.</p>

	<p>A DTD can contain declarations that define elements, attributes, notations,
	and entities for any XML files that reference the DTD file. It also establishes
	constraints for how each element, attribute, notation, and entity can be used
	within any of the XML files that reference the DTD file.</p>

	<p>To be considered a valid XML file, the document must be accompanied by
	a DTD (or an XML schema), and conform to all of the declarations in the DTD
	(or XML schema).</p>

	<p>Certain XML parsers have the ability to read DTDs and check to see if the
	XML file it is reading follows all of those rules. While the parser is reading
	the XML file, it will check each line to be sure that it conforms to the rules
	that are laid out in the DTD file. If there is a problem, the parser generates
	an error and points to where the error occurs in the XML file. This kind of
	parser is called a validating parser because it validates the content of the
	XML file against the DTD.</p>

	</div>

	<div>
	<div class="familylinks">
	<div class="parentlink"><strong>Parent topic:</strong> <a href="../topics/tcretdtd.html" title="A document type definition (DTD) contains a set of rules that can be used to validate an XML file. After you have created a DTD, you can edit it manually, adding declarations that define elements, attributes, entities, and notations, and how they can be used for any XML files that reference the DTD file.">Creating DTDs</a></div>
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