Abstract
The paper provides a concise discussion of the most important theoretical aspects of the Association-Oriented Database (AODB) Metamodel. Even though the model has been practically verified, the author has focused on its formal aspects and modeling language. The AODB Metamodel has been developed for the purposes of building the knowledge representation systems. Basically, such systems are structurally and functionally complex, hence they require advanced solutions to be applied for the purpose of data modeling. The modeling language enables designing database structures in the AODB Metamodel, taking into account various features of this database metamodel. The language in question is fully integrated and compatible with AODB Metamodel. It has been developed for the purposes of this metamodel, it operates with categories specific to it and, as such, it constitutes neither a version nor an extension of any of the existing languages. The second part of the paper provides the definition and discussion concerning the graphical modeling language — Association-Oriented Modeling Language (AML). The last section of the paper introduces the case-study that presents the key features of the metamodel, as well as the use of modeling language. The topics of presented examples comprise a simplified model of degree programs for universities and the model of Ontological Core, the main module of Semantic Knowledge Base (SKB).
Highlights
Nowadays, database engineering focuses on excelling the use of relational database model.[1,2] There have been attempts towards the object-oriented databases implementation, so far they have been futile
Its characteristic di®ers from the one known in other metamodels, where visibility scopes are bound with the inheritance properties as well as inheritance modes
The foregoing means that many aspects which frequently is used to be established by means of the system logic layer are supported directly from the database level
Summary
Database engineering focuses on excelling the use of relational database model.[1,2] There have been attempts towards the object-oriented databases implementation, so far they have been futile. The assumptions and properties of the database model developed, being a direct response to the research problems indicated in this scope, have been presented along with a formal denition of the proposed AODB. The paper is completed with the denition and discussion concerning the graphical modeling language It enables designing database structures in the AODB, taking into account various features. Reasons to Undertake the Research Problem This section addresses the most important problems recognized in the sphere of database models from the perspective of model denitions and their consequences It provides substantiation for the main subject elaborated upon and introduces the problems discussed in detail in subsequent sections. Modeling naturalness (intuitiveness), . model's power of expression, . semantic unambiguity of schemata
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