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W3C XML Schema Activities

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XML Schema is the XML based alternative to DTD.

A D V E R T I S E M E N T


XML Schema Tutorial

To learn more about the XML Schema, read our XML Schema tutorial


XML Schema

An XML schema is a description of a type of XML document, typically expressed in terms of constraints on the structure and content of documents of that type, above and beyond the basic syntactical constraints imposed by XML itself. An XML schema provides a view of the document type at a relatively high level of abstraction. 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. Two other very popular, more expressive XML schema languages are XML Schema (W3C) and RELAX NG. The mechanism for associating an XML document with a schema varies according to the schema language. The association may be achieved via markup within the XML document itself, or via some external means.

The process of checking to see if an XML document conforms to a schema is called validation, which is separate from XML's core concept of syntactic well-formedness. 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. DTD-validating parsers are most common, but some support W3C XML Schema or RELAX NG as well. Documents are only considered valid if they satisfy the requirements of the schema with which they have been associated. These requirements typically include such constraints as: Elements and attributes that must/may be included, and their permitted structure The structure is specified by a regular expression syntax How character data is to be interpreted, e.g. as a number, a date, a URL, a Boolean, etc. XML Schema validations can be effectively performed using specialized parsers like JAXB or SAX.




W3C XML Specifications and Timeline

Specification Draft / Proposal W3C Recommendation
     
XML Schema   02. May 2001
XML Schema Structures   02. May 2001
XML Schema Datatypes   02. May 2001
     
XML Schema (2.Ed)   28. Oct 2004
XML Schema Structures (2.Ed)   28. Oct 2004
XML Schema Datatypes (2.Ed)   28. Oct 2004
     
XML Schema Component Designators 29. Mar 2005  

W3C Reference:

W3C XML Schema Home Page



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Keywords: XSD restrictions/facets,web service xsd,xsd tutorial,xsd xml,xsd examples,xsd dtd,xsd validator,xslt xsd,sample xsd

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