Abiteboul, S.; Cluet, S.; Christophides, V.; Milo, T.; Moerkotte, G.; Siméon, J.: Querying documents in object databases (1997)
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- Abstract
- We consider the problem of storing and accessing documents (SGML and HTML, in particular) using database technology. To specify the database image of documents, we use structuring schemas that consist in grammars annotated with database programs. To query documents, we introduce an extension of OQL, the ODMG standard query language for object databases. Our extension (named OQL-doc) allows us to query documents without a precise knowledge of their structure using in particular generalzed path expressions and pattern matching. This allows us to introduce in a declarative langugae (in the style of SQL or OQL), navigational and information retrieval styles of accessing data. We also consider the interaction of full-text indexes (e.g. inverted files) with standard database collection indexes (e.g, B-trees) that provide important speed-up
