errors. An XML document that meets all structural criteria is said to be well-formed. The necessary condition for a document to qualify as XML is that it should be well-formed.

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You can do so with a DTD (document type definition), which further lets your XML parser check that the data you are reading is a well-formed XML document and conforms to your specified layout.

A well-formed XML document conforms to the general rules of XML syntax, which are more rigorous than those of either HTML or SGML (Standard General Markup Language).

What does XML document actually mean? Find out inside PCMag's comprehensive tech and computer-related encyclopedia.