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Last modified: November 26, 2002
Validate/Check XML

Validate or at least check your XML!

Valid and Well-formed XML Documents

An XML document must be well-formed, and in most cases should be valid (conform to a specified document model) as well. The online tools listed above are provided to help users and developers check or validate candidate XML documents. The Extensible Markup Language (XML) 1.0 specification explains the distinction between validating and non-validating XML processors in Section 5.1. In contrast to an XML "well-formedness checker" or "XML Syntax Checker," an "XML Validator" uses an XML validating processor to determine whether a candidate XML document conforms to its schema, expressed formally in the DTD (document type definition). To be valid XML and not merely well-formed XML, the XML document must have a DOCTYPE declaration and it must satisfy the validity constraints expressed by the declarations in the DTD. Validation of XML documents helps ensure that the information is structured in a way that is sensible for applications which use it. XML documents that are merely well-formed can store any element inside of or adjacent to any other element whatever, which usually would not be very helpful.


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Robin Cover, Editor: robin@oasis-open.org