Summary: Multimedia Tools and Applications, 5, 275300 (1997)
c 1997 Kluwer Academic Publishers, Boston. Manufactured in The Netherlands.
Building a Hybrid Database Application for
KLEMENS BOHM AND KARL ABERER fkboehm, firstname.lastname@example.org
GMD-IPSI, Dolivostraße 15, 64293 Darmstadt, Germany
WOLFGANG KLAS email@example.com
Universit¨at Ulm, Fakult¨at f¨ur Informatik, 89069 Ulm, Germany
Received November 25, 1995; Revised March 30, 1996
Abstract. In this article, we propose a database-internal representation for SGML-/HyTime-documents based on
object-oriented database technology with the following features: documents of arbitrary type can be administered.
The semantics of architectural forms is reflected by means of methods that are part of the database schema and
by the database-internal representation of HyTime-specific characteristics. The framework includes mechanisms
to ensure conformance of documents to the HyTime standard. Measures for improved performance of HyTime
operations are also described. The database-internal representation of documents is a hybrid between a completely
structured and a flat representation. Namely, the structured representation is better to support the HyTime
semantics, and modifications of document components. On the other hand, most operations are faster for the flat
representation, as will be shown.
Keywords: SGML HyTime object-orientation database