An Overview on Semantical Constraints
نویسنده
چکیده
Modeling of semantics is one of the most diicult tasks in database design. Constraints are used to express database semantics. They are used diierently in database models. They express domain restrictions, specify relationships between components and state database behavior. The utilization depends on the richness of the type system used in the model. The relational model is using a simple type system and has a very large set of integrity constraints. Semantical models are using richer type systems which express also diierent types of integrity constraints. At the same time, the theory of integrity constraints is more complex. Object-oriented models use either a simple type system or type systems like the semantical models. The theory of integrity constraints is still under development. This overview tries to give a unifying framework on integrity constraints.
منابع مشابه
Overview of Formal Concepts for Model Transformations Based on Typed Attributed Graph Transformation
In this paper we give an overview of formal concepts for model transformations between visual languages based on typed attributed graph transformation. We start with a basic concept where visual languages are defined by attributed type graphs only and model transformations by basic typed attributed graph transformation systems. We continue with different kinds of extensions of the basic concept...
متن کاملA Rule Format for Rooted Branching Bisimulation
SOS rule formats are sets of syntactical constraints over SOS transition rules ensuring semantical properties of the derived LTS. Given a rule format, our proposal is to try to relax the constraints imposed by the format on each single transition rule at the price of introducing some reasonable constraint on the form of the whole set of rules, obtaining a new format ensuring the same semantical...
متن کاملDomain Knowledge Integration and Semantical Quality Management -A Biology Case Study-
The management of semantical quality is a major challenge in the context of knowledge integration. In this paper, we describe a new approach to constraint management that emphasizes constraint traceability when moving from the semantical level to the operational one. Our strategy for management of semantical quality is related to a metamodeling-based approach to knowledge integration. We carry ...
متن کاملOn Synthesizing Behavior that Is Aware of Semantical Constraints
Without taking care of the semantics of messages, every message is an isolated entity that can be created and sent at will. This leads to anomalies like a synthesized service that sends a filled form before having received the empty form. In this paper we pick up ideas from adapter synthesis for taking care of semantical constraints and develop them into two directions. First, we show that the ...
متن کاملPlanning in a cross dock network with an operational scheduling overview
Nowadays, cross docking plays an important role in the supply chain networks especially in transportation systems. According to the cross dock system advantages such as reducing transportation costs, lead times, and inventories, scheduling in a cross-dock center would be more complicated by increasing the number of suppliers, customers and product types. Considering the cross dock limited capac...
متن کامل