Data Model Patterns: A Metadata Map by David C. Hay

By David C. Hay

In recent times, businesses and govt businesses have come to gain that the information they use signify an important company source, whose fee demands administration every piece as rigorous because the administration of human assets, cash, and capital gear. With this awareness has come reputation of the significance to combine the knowledge that has routinely in simple terms been to be had from disparate assets. an enormous section of this integration is the administration of the "metadata" that describe, catalogue, and supply entry to some of the kinds of underlying enterprise facts. The "metadata repository" is key conserving song either one of some of the actual parts of those platforms, but in addition their semantics. What can we suggest via "customer?" the place will we locate information regarding our consumers? After years of establishing firm types for the oil, pharmaceutical, banking, and different industries, Dave Hay has the following not just constructed a conceptual version of one of these metadata repository, he has in reality created a real firm information version of the knowledge expertise itself. * A finished paintings according to the Zachman Framework for info architecture-encompassing the enterprise Owner's, Architect's, and Designer's perspectives, for all columns (data, actions, destinations, humans, timing, and motivation) * presents a step by step description of version and is prepared in order that diverse readers can make the most of assorted components * presents a view of the realm being addressed via all of the options, equipment and instruments of the knowledge processing (for instance, object-oriented layout, CASE, enterprise approach re-engineering, etc.) * provides many techniques that aren't presently being addressed via such instruments - and will be

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Each of these is of data type “string”, meaning that its value will be a piece of text. 1]”, which means that an occurrence of ProductType can have no value for either of those two attributes, if appropriate. Note that usually the object classes are related to each other in pairs, as indicated by the lines between them. A line connecting two boxes means that an occurrence of one object class is associated in some way to occurrences of another object class. The relationship names are intended to be read in each direction as, for example, “Each Customer may be the buyer in one or more SalesOrders”, and “Each SalesOrder must be from one and only one Customer”.

As such, it may be represented by any of the techniques available for describing data structure. These include various forms of entityrelationship modeling, information engineering, UML, and so forth. Before getting into the details of the metamodel, it is worth exploring the issue of notation. Because the metadata being presented are in fact data, let’s delve into the Data column of the Architecture Framework to explore the concepts behind a data model. ∗ In a UML class diagram, we can represent an object class as the definition of a business object—a thing of significance to an organization about which it wishes to capture information.

For this reason, in this book we must produce a model that is not quite as abstract as that presented in Figure 1–8. In preparing this book, your author has worked hard to reach the right level of abstraction. It is for you, the reader, to determine whether he has been successful. ∗ But you don’t have to know that in order for them to make sense. This Page Intentionally Left Blank 2 DATA The kinds of question we ask are as many as the kinds of things which we know. They are in fact four: 1. 2. 3.

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