eXtensible Server Pages (XSP) is an XML-based language, which offers the possibility of dynamically arranged Java code into XML documents.
Extensible Markup Language (XML) is a markup language that defines a set of rules for encoding documents in a format that is both human-readable and machine-readable. The W3C's XML 1.0 Specification and several other related specifications—all of them free open standards—define XML.
It was developed by the Apache Software Foundation for the Web Publishing Framework Cocoon. The focus of XSP is the separation of content, logic and presentation. The Java program code is in its own XML section <xsp:logic> that can either occur within or outside of the root element (<xsp:page>).
Apache Cocoon, usually just called Cocoon, is a web application framework built around the concepts of pipeline, separation of concerns and component-based web development. The framework focuses on XML and XSLT publishing and is built using the Java programming language. The flexibility afforded by relying heavily on XML allows rapid content publishing in a variety of formats including HTML, PDF, and WML. The content management systems Apache Lenya and Daisy have been created on top of the framework. Cocoon is also commonly used as a data warehousing ETL tool or as middleware for transporting data between systems.
The Java code is compiled with the first call. These directives are replaced by the generated content so that the resulting, augmented XML document can be subject to further processing with XSL Transformations.
XSP pages are transformed into Cocoon producers, typically as Java classes, though any scripting language for which a Java-based processor exists could also be used.
Directives can be either XSP built-in processing tags or user-defined library tags. XSP built-in tags are used to embed procedural logic, substitute expressions and dynamically build XML nodes. User-defined library tags act as templates that dictate how program code is generated from information encoded in each dynamic tag.
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