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

By David C. Hay

In recent times, businesses and executive organizations have come to achieve that the knowledge they use symbolize an important company source, whose fee demands administration every piece as rigorous because the administration of human assets, funds, and capital gear. With this recognition has come attractiveness of the significance to combine the information that has characteristically in simple terms been on hand from disparate resources. a huge section of this integration is the administration of the "metadata" that describe, catalogue, and supply entry to some of the types of underlying enterprise information. The "metadata repository" is vital maintaining music either one of a number of the actual parts of those platforms, but additionally their semantics. What can we suggest via "customer?" the place will we locate information regarding our consumers? After years of creating company versions 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 truth created a real firm information version of the knowledge know-how 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) * offers a step by step description of version and is equipped in order that varied readers can take advantage of various components * presents a view of the realm being addressed through all of the thoughts, equipment and instruments of the knowledge processing (for instance, object-oriented layout, CASE, enterprise technique re-engineering, etc.) * offers many ideas that aren't presently being addressed by means of such instruments - and will be

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Thus, according to this view the definition of terms (that is, their underlying business concepts) establishes a category of business rule. For example, this can be a term used in a data model (such as product type) or one simply used in the business, such as prestige client. THE BUSINESS OWNER AND BUSINESS RULES Objectives/ Scope 35 Data (What) Activities (How) Locations (Where) People (Who) Time (When) Motivation (Why) List of things important to the enterprise List of functions the enterprise performs List of enterprise locations Organization approaches Business master schedule Business vision and mission Language, divergent data model Business process model Logistics network Organization chart State/ transition diagram Business strategies, tactics, policies, rules Convergent e/r model Essential data flow diagram Locations of roles The viable system, use cases Entity Life History Business rule model Database design System design, program structure Hardware, software distribution User interface, security design Event processing Business rule design Detailed program design Network architecture, protocols Screens, security coding Timing definitions Rules specification program logic Business events Enforced rules (Planner’s View) Enterprise Model (Business Owner’s View) Model of Fundamental Concepts (Architect’s View) Technology Model (Designer’s View) Detailed Representation 1 Physical storage design (Builder’s View) (Working System) Functioning System Databases Program inventory, logs Communications facilities Trained people Fig.

This second RelationshipEnd, then, must be connected to another EntityType. • Each EntityType may be a super-type of two or more other EntityTypes (Each EntityType may be a sub-type of one and only one other EntityType). Funny thing about the metamodel of entities and relationships: with a couple of names changed, Figure 1–6 (a metamodel of entity types and relationship ends) looks just like Figure 1–5’s metamodel of objects and roles. This is not a coincidence. They in fact represent the same things.

That is, for every occurrence of ObjectClass there must be exactly one value for “Name”. Because it is a thing we are interested in, “Attribute” is also an example of an object class on the diagram. Attribute also has attributes, which include its “Name”, as well as its “Data Type”, “Maximum Length”, “Average Length”, “number of Decimal places”, and “Optionality”. Again, “Name” is mandatory, as is “Optionality”, but other attributes may have either zero or one value for each— they are optional.

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