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abstract contract

See logical contract.

abstract head element

An XML Schema element that cannot appear in an instance document. When a substitution group's head element is declared as abstract with abstract="true", a member of that element's substitution group must be used instead.

anyType

The root type for all XML Schema type definitions hierarchies. All primitive types are derivatives of this type, as are all user-defined complex types.

application server

A software platform that provides the services and infrastructure required to develop and deploy middle-tier applications. Middle-tier applications implement the business logic necessary to provide web clients with access to enterprise information systems. In a multi-tier architecture, an application server sits beside a web server or between a web server and enterprise information systems. Application servers provide the middleware for enterprise systems. JBoss, WebLogic and WebSphere are J2EE application servers.