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. Parts2.3.4. Summary of Discrete Endurants115• The unique identifier property cannot necessarily be observed:– it is an abstract concept and– can be objectively “assigned”.That is: unique identifiers are not required to be manifest.• The mereology property also cannot usually be observed:– it is also an abstract concept,– but can be deduced from careful analysis.That is: mereology is not required to be manifest.• The attributes can be observed:– usually by simple physical measurements,– or by deduction from (conceptual) facts,That is: attributes are usually only “indirectly” manifest.A Precursor for Requirements Engineering 115 c○ Dines Bjørner 2012, DTU Informatics, Techn.Univ.of Denmark – July 20, 2012: 12:33
1162. Domain Entities 2.3. Parts2.3.4. Summary of Discrete EndurantsDiscrete Endurant Modelling I/IIFaced with a phenomenon the domain analyser has to decide• whether that phenomenon is an entity or not, that is, whether– an endurant or– a perdurant or– neither.• If endurant and if discrete, then whether it is– an atomic part or– a composite part.• Then the domain analyser must decide on its type,– whether an abstract type (a sort)– or a concrete type, and, if so, which concrete form.c○ Dines Bjørner 2012, DTU Informatics, Techn.Univ.of Denmark – July 20, 2012: 12:33 116 Domain Science & Engineering
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2. Domain Entities 2.3. Parts2.3.4. Summary of Discrete Endurants115• The unique identifier property cannot necessarily be observed:– it is an abstract concept and– can be objectively “assigned”.That is: unique identifiers are not required to be manifest.• The mereology property also cannot usually be observed:– it is also an abstract concept,– but can be deduced from careful analysis.That is: mereology is not required to be manifest.• The attributes can be observed:– usually by simple physical measurements,– or by deduction from (conceptual) facts,That is: attributes are usually only “indirectly” manifest.A Precursor for Requirements Engineering 115 c○ Dines Bjørner 2012, <strong>DTU</strong> <strong>Informatics</strong>, Techn.Univ.of Denmark – July 20, 2012: 12:33
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