XML is gaining acceptance as a universal format for data interchange and data publication. The proliferation of different document type descriptions or XML Schemas, however, requires still adequate treatment of heterogeneity, in particular the transformation of documents between different schemas by XSLT programs. We propose a new way to define XSLT transformations for XML Schema based documents. Transformations are based on types defined in XML Schemas. Transformations of complex documents may be composed of transformations on subcomponents of these documents. A library stores information about available transformations and their relation to schemas and types and is instrumental in decomposing a document in a way that promotes the application of already available transformations on subcomponents. Therefore the tedious and error-prone work of programming transformations can be made easier and more efficient through reuse.

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