State-of-the-Art: Semantics Acquisition and Crowdsourcing - Semantic Acquisition Games: Harnessing Manpower for Creating Semantics - page 28

this topic, we identified a particular domain of personal image metadata creation, in
which all families of approaches are nowadays shorthanded. The personal multime-
dia creation cannot be subjected to either automatedmeans or crowds, because neither
of these possesses the specific knowledge (e.g., awareness about person names or
specific places).
As another issue, we address in this topic, we identified the upkeep of the seman-
tics. Nowadays, researchers are primarily focused on semantics creation and only
little attention is given to already created semantics. Yet, this existing corpora must
be constantly reviewed, validated and updated. Many times, metadata are temporal
“by definition” or are invalidated by the change of the underlying resource. The meta-
data may also be wrong from the moment they are created (after all, the automated
and crowd-based method are sometimes prone to errors). All of these “effects” may
render a metadata corpus partially invalid and a needed subject to cleanup (remov-
ing incorrect or invalid facts) and a potential “renovation” of semantics (creating
new, correct facts to as substitute the removed). In this work, we chose the domain
of music metadata corpora, created by human taggers, as a candidate for metadata
cleanup (realized through crowdsourcing games).
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