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Generic Programming for XML Tools

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XML tools and claims that generic programming is ideally suited for implementing many ..... We want to thank the 2001 XML and Generic Programming class for ...

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Generic Programming for XML ToolsPage 1Generic Programming for XML ToolsJohan Jeuring and Paul HaggInstitute of Information and Computing Sciences Utrecht UniversityThe Netherlandsjohan@jeuring.netMay 27 2002AbstractA generic program is written once and works on values of a large class of data types (orDTDs schemas structures class hierarchies). This paper shows how generic programmingcan be used to implement XML tools such as XML editors databases and compressors thatdepend on the DTD of an input XML document. The resulting tools usually perform betterbecause knowledge of the DTD can be used to optimise the tools and are smaller because allDTD handling is dealt with in the generic programming compiler. The paper shows how anXML compressor is implemented as a generic program and it discusses which other classesof XML tools would profit from an implementation as a generic program.1 IntroductionGeneric Programming. A generic program is a program that works on values of a large classof data types (or DTDs schemas structures class hierarchies). An example generic program isequality: a function that takes two values and returns a boolean value depending on whether or notthe two argument values are equal. Equality is defined on many different kinds of data types andit can be defined once and for all as a generic program. The generic program says that two valuesare equal provided the top nodes are equal and that the top nodes have equally many childrenwhich are pairwise equal. This paper describes the relation between generic programming andXML tools and claims that generic programming is ideally suited for implementing many XMLtools.XML Tools. Since W3C released XML 36] the de facto data format standard on the webhundreds of XML tools have been developed. There exist XML editors XML databases XMLconverters XML parsers XML validators XML search engines XML encryptors etc. Informationabout XML tools is available from many sites see for example 16 18]. Flynns book 15] provid ...

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