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-<?xml version="1.0" encoding="utf-8"?>
-<!--Arbortext, Inc., 1988-2005, v.4002-->
-<!DOCTYPE concept PUBLIC "-//OASIS//DTD DITA Concept//EN"  "concept.dtd">
-<concept id="cdtdover" xml:lang="en-us">
-<title>Document type definitions (DTDs) - overview</title>
-<titlealts>
-<searchtitle>Document type definition (DTD) - overview</searchtitle>
-</titlealts>
-<shortdesc>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.</shortdesc>
-<prolog><metadata>
-<keywords><indexterm>DTDs (document type definitions)<indexterm>overview</indexterm></indexterm>
-</keywords>
-</metadata></prolog>
-<conbody>
-<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>
-</conbody>
-</concept>