What is ?Well Formed XML? and ?Valid XML?

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What is ?Well Formed XML? and ?Valid XML?..

Answer / manoj joshi

W3C, in the XML specification, has defined certain rules
that need to be followed while creating XML documents. The
examples of such rules include: having exactly one root
element, having end-tag for each start- tag, using
single/double quotes for attribute values, and so on. If an
XML document follows all these rules, it is said to be well-
formed document and XML parsers can be used to parse and
process such documents.
Document Type Definitions (DTDs) or XML Schemas can be used
to define the structure and content of a specific class of
XML documents. This includes the parent-child relationship
details, attribute lists, data type information, value
restrictions, etc. In addition to the well-formedness
rules, if an XML document also follows the rules specified
in the associated DTD/Schema, it is said to be a valid XML
document. All valid XML documents are well-formed; but the
reverse is not always true, that is, well-formed XML
documents do not necessarily have to be valid.

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