This paper discusses the role of the semantic data models in addressing the concerns of non-standard data such as text, music, design information and pictures. It begins with a review of three prominent models and then discusses the general features used to compare semantic data models. Next, the evolution of database systems is considered. Descriptions of modern systems that are not transaction-oriented are provided. Finally, semantic data model features are linked to specific database environments. General research directions for the 1990’s are discussed.
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