A valid document by definition, is a well-formed XML document. But validity goes one step further. A valid XML document is also a well-formed SGML document, and as such, can be read and interpreted as one. In the last section, we reviewed the process of creating a "well-formed" XML document. As you saw, there are many rules you must follow in order to assure that your XML document is well-formed. But even when you write well-formed XML documents, you're not quite out of the woods! Making your document well-formed is only half the battle. You must also make sure that the document is valid.
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