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What is the difference between a well formed XML document and valid XML document?

The difference between wellformed and valid XML is simple: Valid XML has a DTD associated with it and has been verified against all the rules contained in the DTD in addition to being wellformed. Merely wellformed XML, on the other hand, is not necessarily valid, although it may be.

Similarly one may ask, what is well formed and valid XML document?

Wellformed means just syntactically correct; valid means it conforms to a DTD or Schema. Previous. XML lets you use a Schema or Document Type Definition (DTD) to describe the markup (elements and other constructs) available in any specific type of document.

Subsequently, question is, what is a valid XML file? A valid XML document is defined in the XML specification as a well-formed XML document which also conforms to the rules of a Document Type Definition (DTD). In other words a well formed XML document does not need a DTD, but it must conform to the XML syntax rules.

Then, when can an XML document be called as valid document?

An XML document is valid if there is a document type definition (DTD) or XML schema associated with it, and if the document complies with that DTD or schema.

What can you call the set of rules that an XML document must follow to be valid?

An XML document is called well-formed if it satisfies certain rules, specified by the W3C. These rules are: A well-formed XML document must have a corresponding end tag for all of its start tags. Nesting of elements within each other in an XML document must be proper.


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