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In summary, the ROSE system has been designed to allow efficiency to be combined with fiexibility for support of interactive computer graphics applications. The object paradigm is exploited throughout all aspects of the ROSe system because it provides a natural data organization for graphical data, and because it leads to clustering ofdata in secondary storage to maximize the performance of data retrieval...
Entities such as mechanical assemblies are recursive when they contain other assemblies at a lower level of detail. In this paper we show how recursive CAD entities can be manipulated using an extended projection function. The new function finds nested sub-entities within entities that are modeled as trees of aggregations and generalizations. It allows these sub-entities to be found using expressions...
Purpose. This paper defines a layered functional architecture that is useful for describing interfaces (data or parameter exchanges) between Ada and Data Management Systems (DMS). It uses this architecture in discussing potential approaches to implementating standard interfaces between Ada and both relational and CODASYL DMSs.
This paper focuses on the problem of management of CAD data by investigating the use of the software engineering principles of data abstraction and object-oriented programming as means for managing the volume and complexity of design data. It discusses how a data management system which manages abstract data types provides a framework for integrating a CAD environment by providing a single mechanism...
Database management systems (DBMS's) today are usually built as subsystems on top of an operating system (OS). This design approach can lead to problems of unreliability and inefficient performance as well as forcing a duplication of functions between the DBMS and OS. A new design approach is proposed which eliminates much of this duplication by integrating the duplicated functions into independent...
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