In recent years, several models have been proposed for recording provenance of data. Our work is motivated by opportunities to make provenance easy to manage and query. For example, current approaches model pro
The data modeling component of UML (now UML-2) has a great deal of similarity with the ER model, and will be presented in detail in Chapter 3. We will use both the ER model and UML to illustrate the data modeling and logical database design examples throughout this book. In conceptual...
Logical data model example For instance, if you’re going with a relational model, the logical model might look like this: However, with a document database, the schedule can be modeled directly as part of the route. There’s no need for a foreign key, but it’s still helpful to consi...
may include objects other than those listed in the conceptual model, but if so, those extra objects should be invisible to users. Purely implementation objects and their associated actions—such as a text buffer, ahash table, or a database record—do not belong in a conceptual model. ...
Example: In the Fleet Management scenario we consider the delivery system, and particularly the vehicle dispatching subsystem as the event provider. Let us assume that the vehicle dispatching subsystem is a business application storing its data in a relational database. "Delivery change" is a ...
Figure 1. General authorization model Traditional applications bundle the policy enforcer and resource manager into one process. An example of this structure is Security Access Manager WebSEAL. The independent functions of these authorization components allow flexibility in the design of the security enf...
Figure 1. General authorization model Traditional applications bundle the policy enforcer and resource manager into one process. An example of this structure is Security Verify Access WebSEAL. The independent functions of these authorization components allow flexibility in the design of the security enfo...
For information about the School model example, seeCreating the School Sample Database (Entity Framework Quickstart)andGenerating the School .edmx File (Entity Framework Quickstart). Copy <Function Name="YearsSince" ReturnType="Edm.Int32"> <Parameter Name="date" Type="Edm.DateTime" /> <Defining...
from a model for the purpose of navigation. Semantic structure enables route-finding and guidance in terms of object categories that are directly meaningful to humans. For example, a door can afford transition between two enclosed spaces and a roadway is strong enough, large enough, and smooth ...
In order to describe the higher level modeling capabilities of the next-generation data platform we need to introduce some basic database design concepts. Today's dominant information modeling methodology for producing database designs factors an information model into four main levels: physical, logica...