Differentiate between validating and non validating xml parser
Validation checks that the input conforms to the rules of a specific XML vocabulary, for example that a table contains exactly one thead and one tbody. In ordinary English, a schema is defined as "an outline or image universally applicable to a general conception, under which it is likely to be presented to the mind; as, five dots in a line are a schema of the number five; a preceding and succeeding event are a schema of cause and effect" (Websters).
It is generally considered complex, partly because of the number of features, and partly because of the style of the recommendation which describes the validation process more than the modeling features.
The list which I propose below is not exhaustive, and it includes only the major proposals that have influenced the schema languages covered in this article.
A simplified version of SGML DTDs was introduced in the XML 1.0 Recommendation (XML) .
This, together with the fact that its datatype system is weak and only applies to attributes, is one of the main motivations for the W3C to develop a new schema language.
The DTD for our sample could be W3C XML Schema was published by the W3C to provide an alternative to XML DTD that supported namespaces, facilitates the design of open and extensible vocabularies, and meets the requirement of data-oriented applications for a richer datatyping system.
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Inherited from SGML, the XML DTD is the most widely deployed means of defining an XML schema.