NICE TO SEE YOU BACK - DTU Informatics
NICE TO SEE YOU BACK - DTU Informatics NICE TO SEE YOU BACK - DTU Informatics
2. Domain Entities 2.3. Parts2.3.1. Atomic and Composite Parts2.3.1.4. Abstract Types, Sorts, and Concrete Types77Observers for Composite Parts I/II• Let the domain describer decide– that a type, A (or ∆), is composite– and that it consists of sub-parts of types B, C, . . . , D.• We can initially consider these types B, C, . . . , D, as abstract types,or sorts, as we shall mostly call them.• That means that there are the following formalisations:– type A, B, C, ..., D;– value obs B: A→B, obs C: A→C, ..., obs D: A→D.A Precursor for Requirements Engineering 77 c○ Dines Bjørner 2012, DTU Informatics, Techn.Univ.of Denmark – July 20, 2012: 12:33
782. Domain Entities 2.3. Parts2.3.1. Atomic and Composite Parts2.3.1.4. Abstract Types, Sorts, and Concrete TypesObservers for Composite Parts II/II• We can also consider the types B, C, . . . , D, as concrete types,– type Bc = TypBex, Cc = TypCex, ..., Dc = TypDex;– value obs Bc: B→Bc, obs Cc: C→Cc, ..., obs Dc: D→Dc,– where TypBex, TypCex, ..., TypDex are type expressions as, forexample, hinted at above.• The prefix obs distinguishes part observers– from mereology observers (uid , mereo ) and– attribute observers (attr ).c○ Dines Bjørner 2012, DTU Informatics, Techn.Univ.of Denmark – July 20, 2012: 12:33 78 Domain Science & Engineering
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2. Domain Entities 2.3. Parts2.3.1. Atomic and Composite Parts2.3.1.4. Abstract Types, Sorts, and Concrete Types77Observers for Composite Parts I/II• Let the domain describer decide– that a type, A (or ∆), is composite– and that it consists of sub-parts of types B, C, . . . , D.• We can initially consider these types B, C, . . . , D, as abstract types,or sorts, as we shall mostly call them.• That means that there are the following formalisations:– type A, B, C, ..., D;– value obs B: A→B, obs C: A→C, ..., obs D: A→D.A Precursor for Requirements Engineering 77 c○ Dines Bjørner 2012, <strong>DTU</strong> <strong>Informatics</strong>, Techn.Univ.of Denmark – July 20, 2012: 12:33
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