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2. Domain Entities 2.3. Parts2.3.2. Properties2.3.2.3. Attributes 2.3.2.3.1 Static and Dynamic Attributes107Attribute Types and Observers, I/II• Let the domain describer decide that parts of type P• have attributes of types A 1 , A 2 , ..., A t .• This means that the following two formal clauses arise:– P, A 1 , A 2 , ..., A t and– attr A 1 :P→A 1 , attr A 2 :P→A 2 , ..., attr A t :P→A tA Precursor for Requirements Engineering 107 c○ Dines Bjørner 2012, DTU Informatics, Techn.Univ.of Denmark – July 20, 2012: 12:33
1082. Domain Entities 2.3. Parts2.3.2. Properties2.3.2.3. Attributes 2.3.2.3.1 Static and Dynamic AttributesAttribute Types and Observers, II/II• We may wish to annotate the list of attribute type names as towhether they are static or dynamic, that is,– whether values of some attribute type– vary or– remain fixed.• The prefix attr distinguishes attribute observersfrom part observers (obs ) and mereology observers (uid , mereo ).c○ Dines Bjørner 2012, DTU Informatics, Techn.Univ.of Denmark – July 20, 2012: 12:33 108 Domain Science & Engineering
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