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<p><it>Abstract</it>—Advanced database applications require facilities such as text indexing, image storage, and the ability to store data with a complex structure. However, these facilities are not usually included in traditional database systems. In this paper we describe Atlas, a nested relational database system that has been designed for text-based applications. The Atlas query language is TQL, an SQL-like query language with text operators. The query language is supported by signature file text indexing techniques, and by a parser that can be configured for different text formats and even some foreign languages. Atlas can also be used to store images and audio.</p>
Text database system, nested relations, signature files, text compression, hypermedia, hypertext.

J. Thom, R. Sacks-Davis, A. Kent, K. Ramamohanarao and J. Zobel, "Atlas: A Nested Relational Database System for Text Applications," in IEEE Transactions on Knowledge & Data Engineering, vol. 7, no. , pp. 454-470, 1995.
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