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Programming with Heterogeneous Structures: Manipulating XML data Using

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However adding XML manipulation. to a generalpurpose programming language has proven ..... and can greatly simplify programming for XML ma. nipulation. ...

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Programming with Heterogeneous Structures: Manipulating XML data UsingPage 1Programming with Heterogeneous Structures:Manipulating XML data UsingbondiF. Y. HuangSchool of ComputingQueen's Universityhuang@cs.queensu.caC. B. JayFaculty of Information TechnologyUniversity of Technology Sydneycbj@it.uts.edu.auD. B. SkillicornSchool of ComputingQueen's Universityskill@cs.queensu.caAbstractManip ulating semistructured data such as XML doesnot t well within conventional programming languages.A typical manipulation requires ndingalloccurrencesof a structure matching astructuredsearch patternwhose context may bedierentin dierent places andboth aspects cause diculty. If a specialpurpose querylanguage is used to manipulate XML an interface toa more general programming environment is requiredand this interface typically creates runtime overhead fortype conversion. However adding XML manipulationto a generalpurpose programming language has provendicult because of problems associated with expressiveness and typing.We show an alternative approach that handles manykinds of patterns within an existing stronglytypedgeneralpurpose programming language called bondi.The key ideas are to express complex search patterns asstructures of simple patterns pass these complex patterns as parameters to generic dataprocessing functionsand traverse heterogeneous data structures by a generalized form of pattern matching. These ideas are madepossible by the language's support for pattern calculuswhose typing on structures and patterns enables pathand pattern polymorphism. With this approach addinga new kind of pattern is just a matter of programmingnot language design.Keywords: Pattern Calculus functional programming heterogeneous data structure XML processing1 IntroductionWhen processing semistructured data such as XMLa basic operation is to locate data items by theirposition in a structured context usually describedby a pattern or sequence of patterns. In some situations these patterns can be as si ...

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