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Figure 8. A snippet of the used ontology
the proximity presence of the Bluetooth-enabled
personal devices and conclude the presence of
the device owners. We use some concepts of the
SO4PC ontology (Man et al. 2005) for expressing
context information associated with persons, time,
and spaces; and another ontology for describing
the research related concepts. Figure 8 shows a
snippet of the classes and properties used in the
ontology.
Figure 9 (a) shows an example of a context
feature model that represents different features
that could be shared among different applications.
For example, if the Location feature has been
selected, then two mutually-exclusive options are
available; either as a room resolution; or as a
building resolution. In either case, different con-
cepts, properties, attributes and rules should be
considered. In a similar manner, the Role feature
regroups two features: the static role (e.g. a Re-
viewer, OrganisingCommitteeMember, etc) or the
current role played during the conference (e.g.
Presenter, SessionChair, etc). Figure 9 (b) shows
one possible context feature configuration.
Each feature may have several attributes. For
example, in Figure 10 that shows a part of the
feature model configuration XML file, the Hav-
ingJournalPublications feature has two attributes:
value which indicates the selection of the feature
or not, and minimumJournalRank. This feature
allows the retrieval of researchers who have been
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