Report From the 1986 Workshop on Integrated Data Base Development for the Building Industry (1987) / Chapter Skim
Currently Skimming:
'DATA MODELING'
'DATA MODELING'
Pages 29-38
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From page 29... ...
By comparison, the data model that evolved during the 1985 Woods Hole Workshop identified the basic data types, relationships, and attributes that a building data base would have to support and that could be used to express the contents of the semantic model. Thus, in an overall framework, the previous data model fits between the semantic model developed this year and a physical data base implementation.
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From page 30... ...
Finally, the group developed several examples of how a user view can be extracted from the data base according to the conceptual model. It should be noted that, in its work, the working group indicated only the kind of semantic information that was needed and did not try to develop a supporting semantic model.
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From page 31... ...
The first steps in this approach, contained within the box in Figure 3-1, are (1) definition and analysis of the tasks that must be supported by the data base, (2)
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From page 32... ...
Methodologies providing these capabilities have been, or are being, developed for different types of data models that capture semantic information including the entity-relationship model, the extended relational model, the functional data model, the semantic association model, the semantic data model, and the semantic hierarchical model. It is not clear which, if any, of these models provides the best fit to building project information.
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From page 33... ...
ROLES Role of Object 1 Role of Object 2 NOLOT 1 ROLE OF NOLOT 1 ROLE OF NOLOT 2 NOLOT1 2 BRIDGE OR REFERENCE ROLES NOLOT 1 ROLE OF NOLOT 1 ROLE OF LOT1 UNIQUENESS CONSTRAINT 1 TO MANY 1 TO 1 MANY TO MANY MANY TO 1 FIGURE 3-2 The semantic information model.
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From page 34... ...
The Semantic Information Model is also known as a conceptual model. From the conceptual model the logical data base schemas, the program views for each of the physical data bases, and the logical internal schema for the computerized parts of the information system can be determined.
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From page 35... ...
The user is provided a set of tools and menus to facilitate the query and use of the data. The data base is composed of a conceptual model DATA TYPE1 DATA TYPE 2 DATA TYPE 3 INTEGRATOR DATA MODEL REFERENCE VIEW1 REFERENCE VIEW 2 CONCEPTUAL A MODEL )
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From page 36... ...
At the detailed level, the data model should be established that will support selected realistic user queries representative of facility management functions, the scenarios established, the data models used and the data base management approach implemented. It should be designed to address some of the key data modeling questions identified in the next section.
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From page 37... ...
The analyst's knowledge of data modeling is instrumental in efficiently representing the data relationships in the data base. GENERALIZED DATA MODEL TRUSS DATA MODEL FIGURE 3-4 Generalized data model.
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From page 38... ...
Finally, the group recommended that the prototype IDB, if developed further, take into account advances in data base technology developed in other areas so that the IDB prototype is acknowledged to contain state-of-the-art characteristics and refinements which will enhance its acceptability and appeal to the building community.
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