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2. Domain Entities 2.1. Entities412.1. Entities• Ontologically we distinguish between two kinds of domain entities:– endurant entities and– perdurant entities.• We shall characterise these two terms– endurants on Slide 51 and– perdurants on Slide 145.• This distinction is supported by current literature on ontology[BarrySmith1993].• In this section of this lecture we shall briefly enter a discourse on– “things”,– entities,– objects,– etcetera.A Precursor for Requirements Engineering 41 c○ Dines Bjørner 2012, DTU Informatics, Techn.Univ.of Denmark – July 20, 2012: 12:33
422. Domain Entities 2.1. Entities2.1.1. Things, Entities, Objects2.1.1. Things, Entities, Objects• In colloquial language, that is, in the vernacular, everyday speech,– we may refer to that which we are talking about, describing,identifying, as the∗ ‘thing’,∗ ‘entity’,∗ ‘object’,∗ ‘individual’,∗ ‘unit’,∗ ‘term’,∗ ‘particular’,∗ ‘quantity’,.etcetera.• The problem is:– we need words– and we use words,– and, to avoid confusion, we should use one word, one term,– per concept.c○ Dines Bjørner 2012, DTU Informatics, Techn.Univ.of Denmark – July 20, 2012: 12:33 42 Domain Science & Engineering
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118LONG BREAKc○ Dines Bjørner 20
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