Efficient document management is extremely important as a tremendous volume of documents are produced and accessed by modern information systems. A document management system is described in this paper. The system stores SGML documents in an ObjectStore object-oriented database and is capable of storing, within one database, different types of documents by accommodating multiple DTDs. We create an object type for all DTDs and store each DTD as an object of that object type. We create an object type for each element definition in a DTD and store each element of an SGML document as an object. This database representation is advantageous to declarative query and fine-grained modification of documents. The system supports automatic creation of object types and insertion of documents into the database. Two different interfaces are provided for the user to retrieve, modify, and delete documents. The system supports declarative query of documents, which can be made with respect to their contents or structure.
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