Data Model Patterns: Conventions of Thought by David C. Hay
By David C. Hay
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48 DATA MODEL PATTERNS PRODUCT . Serial number Wan example of I . d' I embodle In I .. PRODUCT TYPE . 1: Products and Product Types. 2 shows that it may be useful to group both into PRODUCT CATEGORIES. PRODUCTS and PRODUCT TYPES CLASSIFICATION PRODUCT of · Effective dale • Until dale subject toi . 2l PRODUCT TYPE . Model number · Description . 2: Product Categories. While a PRODUCT is an example of only one PRODUCT TYPE, a PRODUCT or PRODUCT TYPE may be classified into more than one PRODUCT CATEGORY.
17: Reporting Relationships. Having established REPORTING RELATIONSHIPS between ORGANIZATIONS, we face another issue. It is possible and often necessary to describe relationships between PEOPLE as well, and relationships between PEOPLE and ORGANIZATIONS. We've already seen EMPLOYMENT as one relationship between PEOPLE and ORGANIZATIONS. Because this relationship is often referred to directly, and requires special treatment, it was modeled explicitly. This is only one example, however, of a relationship that can exist between two parties.
Is that organizations at least, and many people too, have more than one address, such as "shipping address," "billing address," "home address," and so forth. 9. Here, each ADDRESS must be the location of one and only one PARTY. Each PARTY, in turn, may be at one or more ADDRESSES. "* Alternatively, ADDRESS might have only the attribute "city, state, and postal code" as a single string. In either case, ADDRESS should also include as an attribute address "type," that could be "billing address," "shipping address," "home address," and so forth.