What is the difference between a well-formed XML document and a valid XML document?
What will be an ideal response?
The XML specification provides for two levels of document processing: well-formed and
valid. A non-validating processor ensures that an XML document is well-formed before
passing the information in the document on to the application. An XML document that
conforms to the structural and notational rules of XML is considered well-formed. Among
others, well-formed XML documents must conform to the following rules:
? the document must start with the XML declaration ;
? all elements must be contained within one root element;
? elements must be nested in a tree structure without any overlap;
? all non-empty elements must have a start-tag and an end-tag.
A validating processor will not only check that an XML document is well-formed but that it
also conforms to a DTD, in which case the XML document is considered valid.
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