ESSQL: an enhanced semi-structured query language for composite document retrievals
Proceedings of the 16th annual international conference on Computer documentation
Materializing Web Data for OLAP and DSS
WAIM '00 Proceedings of the First International Conference on Web-Age Information Management
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We describe the external data manager component of the Lore database system for semistructured data. Lore's external data manager enables dynamic retrieval and integration of data from arbitrary, heterogeneous external sources during query processing. The distinction between Lore-resident and external data is invisible to the user. We introduce a flexible notion of arguments that limits the amount of data fetched from an external source, and we have incorporated optimizations to reduce the number of calls to an external source.