Preservation of Intelligibility of Digital Objects - Advanced Digital Preservation - page 159

Fig. 8.11 Identifying related
profiles when dependencies
are disjunctive

AllGaps1 = { {WPlayer}, {Helix, LinuxOS} },

so gap1 = { WPlayer, Helix, LinuxOS }

AllGaps1 = { {WPlayer}, {Helix, LinuxOS} },

so gap2 { WPlayer, WindowsOS,Helix, LinuxOS }

Since gap1

=

⊂ gap2 it follows that videoClip → u .

8.2.4 Methodology for Exploiting Intelligibility-Related Services

Below we describe a set of activities that could be followed by one organization (or
digital archivist curator) for advancing its archive with intelligibility-related ser-

vices. Figure 8.12 shows an activity diagram describing the procedure that could
be followed. In brief the activities concern the identification of tasks, the capturing
of dependencies of digital objects, the description of community knowledge, the
exploitation of intelligibility-related services, the evaluation of the services and the
curation of the repository if needed. Additionally we provide an example clarifying
how an archivist can preserve a set of 2D and 3D images for the communities of
DigitalImaging and Ordinary users.

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Act. 1 Identification of tasks. The identification of the tasks whose performance
should be preserved with the modules of an archive is very important since
these tasks will determine the dependencies types. In our example, the most
usual task for digital images is to render them on screen. Since there are
two different types of images we can specialize this task to 2Drendering
and 3Drendering .

Act. 2 Model tasks as dependencies. The identified tasks from the previous activ-
ity can be modelled using dependency types. If there are tasks that can
be organized hierarchically, this should be reflected to the definition of
the corresponding dependency types. In our example, we can define the
dependency types render , render2D , and render3D , and we can define two