Validating xml xsd tools
A schema is analogous to a grammar for a language; a schema defines what the vocabulary for the language may be and what a valid "sentence" is.There are historic and current XML schema languages: The main ones (see also the ISO 19757's endorsed languages) are described below.DTDs are perhaps the most widely supported schema language for XML.Because DTDs are one of the earliest schema languages for XML, defined before XML even had namespace support, they are widely supported.There are languages developed specifically to express XML schemas.The Document Type Definition (DTD) language, which is native to the XML specification, is a schema language that is of relatively limited capability, but that also has other uses in XML aside from the expression of schemas.Though there are a number of schema languages available, the primary three languages are Document Type Definitions, W3C XML Schema, and RELAX NG.Each language has its own advantages and disadvantages.
Oct 8th, 2008 - The EODM component has been terminated; see the Termination Review slides for details.
Validation of an instance document against a schema can be regarded as a conceptually separate operation from XML parsing.
In practice, however, many schema validators are integrated with an XML parser.
XSD schemas are conventionally written as XML documents, so familiar editing and transformation tools can be used.
As well as validation, XSD allows XML instances to be annotated with type information (the Post-Schema-Validation Infoset (PSVI)) which is designed to make manipulation of the XML instance easier in application programs.
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All XML documents must be well-formed, but it is not required that a document be valid unless the XML parser is "validating", in which case the document is also checked for conformance with its associated schema.