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Two more expressive XML schema languages in widespread use are XML Schema (with a capital S) and RELAX NG.
The mechanism for associating an XML document with a schema varies according to the schema language.
There are several different languages available for specifying an XML schema. The primary purpose of a schema language is to specify what the structure of an XML document can be.
This means which elements can reside in which other elements, which attributes are and are not legal to have on a particular element, and so forth.
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.
The W3C XML Schema language in particular can be quite verbose, while a DTD can be terse and relatively easily editable.
Likewise, WXS's formal mechanism for associating a document with a schema can pose a potential security problem.
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.
Unlike W3C XML Schema, RELAX NG was designed so that validation and augmentation (adding type information and default values) are separate.Tags: Adult Dating, affair dating, sex dating