Specification of Reactive Hardware/Software Systems - Electronic ...

10.2 Instance Structure Diagrams 307
c
c
a
a
b b b c
d
a
c
c
a
a
c
c
a
a
C(E ,...,E )
b b b c
(3) If BSpec e BSpec e 1 ¢ BSpece 2 then first ISD(BSpece 1 ¥ Sysp ) and ISD(BSpec e 2 ¥ Sysp ) are
drawn. All observable channels with the same outer names are connected by a
single arc.
(4) If BSpece BSpece 1 L then ISD(BSpece 1 ¥ Sysp ) is surrounded by a rounded rectangle.
For each observable channel ch of ISD(BSpece 1 ¥ Sysp ) that is not in L, a channel (with
inner and outer name ch) is drawn on the edge of the rounded rectangle. Each of
these channels ch is internally connected by a single arc to all observable channels
with outer name ch of ISD(BSpece 1 ¥ Sysp ).
For instance, ISD(BSpecp £
E1© P1 ¥ E2© P2
§ §
¥ Sys E2© P2 p ) is taken from rule (2)) is given by
a
a
c
c
a
a
b b b c
b
b
b¥ c¦ ¥ Sys p ) (where ISD(BSpec p § § E1© P1 ¥
(5) If BSpec e BSpec e 1 § f then ISD(BSpece 1 ¥ Sysp ) is drawn. If the edge of the drawing
is a single rounded rectangle, then the outer names of all channels are renamed
as dictated by f . Otherwise the drawing is surrounded by a rounded rectangle.
For each observable channel ch of ISD(BSpec e 1 ¥ Sysp ) a channel with inner name ch
and outer name f (ch) is drawn on the edge of the rounded rectangle. Each channel
with inner name ch is internally connected by a single arc to all observable channels
with outer name chi of ISD(BSpec e 1 ¥ Sysp ).
Next to these specific rules there are three global rules which reduce the amount of
channel names in Instance Structure Diagrams:
(6) If the inner name equals the outer name of a channel, the inner name can be deleted.
d
d
d
a
d
d
d
a