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2. Domain Entities 2.3. Parts2.3.2. Properties2.3.2.2. Mereology101type1. U = Pu | Pi | Va | Fo | Jo | Si | We2. UIvalue2. uid U: U → UI3. mereo U: U → UI-set × UI-set3. mereo U(u) as (iuis,ouis)3(a). is (Pu|Pi|Va)(u) → card iusi = 1 = card ouis,3(b). is Fo(u) → card iuis = 1 ∧ card ouis = 2,3(b). is Jo(u) → card iuis = 2 ∧ card ouis = 1,3(c). is We(u) → card iuis = 0 ∧ card ouis = 1,3(d). is Si(u) → card iuis = 1 ∧ card ouis = 0• We omit treatment of axioms for pipeline units– being indeed connected to existing other pipeline units.– We refer to Example 22 on page 127 and 23 on page 131.A Precursor for Requirements Engineering 101 c○ Dines Bjørner 2012, DTU Informatics, Techn.Univ.of Denmark – July 20, 2012: 12:33
1022. Domain Entities 2.3. Parts2.3.2. Properties2.3.2.3. Attributes2.3.2.3 Attributes• By an attribute of a part, p:P, we shall understand– some observable property, some phenomenon,– that is not a sub-part of p– but which characterises p– such that all parts of type P have that attribute and– such that “removing” that attribute from p(if such was possible)“renders” the type of p undefined.• We ascribe types to attributes — not, therefore, to be confusedwith types of (their) parts.c○ Dines Bjørner 2012, DTU Informatics, Techn.Univ.of Denmark – July 20, 2012: 12:33 102 Domain Science & Engineering
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