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

By David C. Hay

Lately, businesses and executive businesses have come to gain that the information they use characterize an important company source, whose rate demands administration every piece as rigorous because the administration of human assets, cash, and capital apparatus. With this consciousness has come popularity of the significance to combine the information that has routinely in simple terms been on hand from disparate resources. an immense element of this integration is the administration of the "metadata" that describe, catalogue, and supply entry to many of the different types of underlying company information. The "metadata repository" is vital holding song either one of some of the actual parts of those structures, but additionally their semantics. What will we suggest through "customer?" the place will we locate information regarding our shoppers? After years of creating firm types for the oil, pharmaceutical, banking, and different industries, Dave Hay has the following not just constructed a conceptual version of this sort of metadata repository, he has in reality created a real company information version of the knowledge expertise itself. * A complete 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 various readers can reap the benefits of diverse elements * offers a view of the realm being addressed by means of the entire options, tools and instruments of the knowledge processing (for instance, object-oriented layout, CASE, company strategy re-engineering, etc.) * provides many recommendations that aren't at the moment being addressed through such instruments - and may be

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The boxes (“Customer”, “SalesOrder”, “LineItem”, and “ProductType”) represent object classes; that is, things of significance to the business about which it wishes to hold information. Within each object class box are listed attributes, describing the information to be captured about each object class. For example, “Customer” is described by “Name”, “Shipping address”, and “Billing address”. 1]”. 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.

It is the set of business concepts that give meaning to our language. This may be something we data modelers characterize as an entity class (such as “Product”), an attribute of such a class (such as “color”), or an instance of a class (such as “IBM ThinkPad Model T24”). More significantly, however, it may also be something of importance to the business that is not necessarily included in our data model (such as “ICD 10”, the medical world’s catalogue of diseases, or completion—an oil industry term for the part of a well with holes in it, through which oil passes from the ground to the well).

Hay’s Requirements Analysis: From Business Views to Architecture [Hay 2003]. 30 ABOUT METADATA MODELS Each thing type may be the object of one or more attribute assignments of a attribute. That is, knowledge of the type of thing something is tells you what characteristics should be collected for it. The actual value of an attribute for a thing is shown in Figure 1–8 as attribute value, which not surprisingly must be of an attribute and for a thing. ATTRIBUTE VALUE of for described by THING RELATIONSHIP from to THING on one side of on the other side of an example of ATTRIBUTE ASSIGNMENT to embodied in THING TYPE RELATIONSHIP from to the object of THING TYPE on one side of on the other side of Fig.

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