XML Validation
by Jan Egil Refsnes
"Well Formed" XML documents
A "Well Formed" XML document is a document that conforms to the XML
syntax rules that we described in the previous chapter.
The following is a "Well Formed" XML document:
<?xml version="1.0"?>
<note>
<to>Tove</to>
<from>Jani</from>
<heading>Reminder</heading>
<body>Don't forget me this weekend!</body>
</note>
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"Valid" XML documents
A "Valid" XML document is a "Well Formed" XML document which
conforms to the rules of a Document Type Definition (DTD).
The following is the same document as above but with an added reference to a
DTD:
<?xml version="1.0"?>
<!DOCTYPE note SYSTEM "InternalNote.dtd">
<note>
<to>Tove</to>
<from>Jani</from>
<heading>Reminder</heading>
<body>Don't forget me this weekend!</body>
</note>
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More about XML DTD
You can read more about DTD in the chapter XML DTD.
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