the Ugo Montanari Festschrift paper - DTU Informatics

6 Dines Bjørner
case xv of
LiDi(li) → (int NetOp(RmvL(li))(hs,ls),line dis(ω))
... end end ⌈⌉ ...
line dis: Ω → Ω
Narrative — Behaviours
By a behaviour we mean a possibly infinite sequence of zero, one or more
actions and events.
We illustrate just one of very many possible transportation behaviours.
A net behaviour is a sequence of zero, one or more executed net operations:
the openings (insertions) of new links (and implied hubs) and the closing
(removals) of existing links (and implied hubs), and occurrences of external
events (limited here to link disruptions).
Formalisation — Behaviours
channel
x:...
value
transportation transition: (N × Ω) → in x (N × Ω)
transportation transition(n,ω) ≡
... ⌈⌉ let xv = x? in case xv of ... end end
... ⌈⌉ let op:NetOp • pre IntNetOp(op)(n) in IntNetOp(op)(n) end ...
transportation: (N × Ω) → in x Unit
transportation(n,ω) ≡
let (n ′ ,ω ′ ) = transportation transition(n,ω) in
transportation (n ′ ,ω ′ ) end
1.3.3 Domain Modelling: Describing Facets
Domain modelling, as we shall see, entails modelling a number of domain
facets.
By a domain facet we mean one amongst a finite set of generic ways of
analysing a domain: a view of the domain, such that the different facets cover
conceptually different views, and such that these views together cover the
domain.
These are the facets that we find “span” a domain in a pragmatically
sound way: intrinsics, support technology, management & organisation, rules
& regulations, scripts and human behaviour: We shall now survey these facets.