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XL: An XML Programming Language

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We present an XML programming language specially designed for the ..... The semantics of the current W3Cs XML related programming languages (XSLT and ...

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XL: An XML Programming LanguagePage 1XL: An XML Programming LanguageDaniela FlorescuINRIAdaniela.florescu@inria.frAndr eas GrunhagenTU Munichgruenhag@in.tum.deDonald KossmannTU Munichkossmann@in.tum.deAbstractWe present an XML programming language specially designed for the implementation of Web services. XLis portable and fully compliant with all W3C standards such as XQuery XML Protocol and XML Schema. Oneof the key features of XL is that it allows programmers to concentrate on the logic of their application. XLprovides highlevel and declarative constructs for actions which are typically carried out in the implementationof a Web service; e.g. logging error handling retry of actions workload management events etc. Issuessuch as performance tuning (e.g. caching horizontal partitioning etc.) can be carried out automatically by animplementation of the language. This way the productivity of the programmers the ability of evolution of theprograms and the chances to achieve good performance are substantially enhanced.1 IntroductionXML is the lingua franca for data exchange on the Internet. Among its many possible uses XML is ideal forpublishing documents on Web sites for storing catalogs in electronic market places and for exchanging databetween business processes. Even though some data sources will probably continue to use relational and objectrelational database systems as a primary form of storage (at least for a certain time) we expect that most datasources will eventually provide XML access for their published data.Software vendors and standard bodies like the W3 consortium have been very active in providing tools (XMLparsers) and standardized languages (XSLT XPointer XPath XQuery etc.) for XML. So far however no imperative programming language has been proposed that is specifically tailored for building XML applications and Webservices and unfortunately sideeffect free languages like XSLT and XQuery are not powerful enough to describethe logic of complex Web service ...

Source: xl.inf.ethz.ch

 

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