Application Servers
Application Server:
A software platform that provides the services and infrastructure required to develop and deploy middle-tier applications. Middle-tier applications perform 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.
From:www.iona.com/support/docs/e2a/asp/5.1/platform/manage/glossary.html
Orbeon PresentationServer
Orbeon PresentationServer is an open source platform that uses standard XForms to make your form-based web applications more user-friendly and simpler to create.
Unlike other web application frameworks based on Java objects or scripting languages, OPS is based on XML documents and XForms. This leads to an architecture perfectly suited for the tasks of capturing, processing, and presenting XML data, and does not require writing any Java or scripting code at all to implement a dynamic presentation layer for your web application.
OPS is built around a user-friendly Ajax-based XForms engine, which brings standard W3C XForms to mainstream browsers, and the XPL engine, a mature, high-performance XML pipeline engine for processing XML data.
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