Information Technology Reference
In-Depth Information
∀mod
i
∈ MOD
,
∀med
j
∈ MED
,
mod
i
rest med
j
expresses that
mod
i
can be
restituted by
med
j
.
Let us consider the set of couples (modality and medium), such as the modality is
restituted by the media:
ITEM
=
{
(
mod
i
,med
j
) such as
mod
i
∈ MOD∧ med
j
∈ MED∧ mod
i
rest med
j
}
Let the function
affect
which associate a couple (modality and media) with an
elementary unit of
UIE
information in
ITEM
.
affect
:
UIE −→ ITEM
The syntax of
PME
is expressed by the following BNF grammar:
PME
::
=
affect
(
UIE
)
| iter
(
n, P ME
)
| affect
(
UIE
)
compl P ME |
affect
(
UIE
)
redun P ME | affect
(
UIE
)
choice P ME
with
n ∈
N
where
Iter
expresses the iteration
n
times an elementary multimodal presentation
pme
:
Iter
:
N
× PME −→ PME
Let the representational interpretation function of the multimodal presentations
repres
defined as follows:
repres
:
PME −→ DR
where
DR
is
the
representational
interpretation
domain
associated
with
the
multimodal presentations. Thus the operators
compl
,
redun
,
choice
express:
-
compl
: the representational complementarity between two elementary
multimodal presentations for the restitution of an elementary unit of information
UIE
;
-
redun
: the representational redundancy between two elementary multimodal
presentations for the restitution of an elementary unit of
UIE
information;
-
choice
: the representational choice between two elementary multimodal
presentations for the restitution of an elementary unit of
UIE
information:
compl
:
PME× PME −→ PME
redun
:
PME× PME −→ PME
choice
:
PME× PME −→ PME
