The XML Schema Definition is a reference library that provides an API for use with any code thatexamines, creates or modifies W3C XML Schema (standalone or as part ofother artifacts, such as XForms or WSDL documents).

XSD is a library that provides an API for manipulating the components of an XMLSchema as described by the W3C XML Schemaspecifications, as well as an API formanipulating the DOM-accessible representation of XML Schema as a seriesof XML documents, and for keeping these representations in agreement asschemas are modified.

The library will include services to serializeand deserialize XML Schema documents, and to do integrity checking ofschemas (for example, not using a maximum value for a simpleType whichis invalid considering the base type of that simpleType). The projectgoal is to support 100% of the functionality of XML schemarepresentation, but not necessarily to provide document against schemaassessment or validation services, which are normally provided by avalidating parser,such as Apache's Xerces-J.