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If I define an element such as this in a DTD
<!ELEMENT ud (#PCDATA)>
Are the following both valid?
<ud>foo & bar</ud>
<ud><![CDATA[foo & bar]]></ud>
Both are valid.
Placing content in a
<![CDATA[]]>section effectively means that whatever is in it will be ignored by the parser.PCDATAmeans only character data is allowed.CDATAmeans, character data, so it is allowed within aPCDATAcontext.