A processing model of foreign functions in an extensible XML query language X{sup}2QL

摘要

Recently, management of structured documents such as XML documents and their databases has become more and more important- Some query languages for XML have been proposed. Most of them provide very limited contents processing capability in contrast with their powerful structure manipulation capability. The contents processing capability is also important to acquire target information efficiently. From this view point, we have proposed X{sup}2QL, which features inclusion of user-defined foreign functions to process document contents in the context of XML-QL-based document structure manipulation. In this paper, we describe an overview of X{sup}2QL and the processing model of foreign functions.