Abstract:
Abstract. XML is today a standard for manipulating semistructured data. One of widely used industrial solutions, especially for systems with a fairly well defined data structure, is storing XML in a relational database, while XML queries are converted to SQL queries to the underlying relational database. A software product that produces XML “interface ” to an underlying relational database commonly requires revision of XML and relational schemas with every new version of the product. Those schema and subsequent data transformations are selected and performed using ad-hoc algorithms. We propose a framework, namely formal evolution model, allowing semi-automatic schema transformation and data transformation for a new product version, thus discarding the necessity of ad-hoc algorithm design. The framework also allows a-priory estimating of query conversion performance.
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