| http://www.w3.org/ns/prov#value | - These problems are a result of the fact that whilst the majority of TV programs may have durations which are simple multiples of 30 minutes, and start times either at the beginning of an hour or at half past an hour, this is by no means universally the case. [0024] The first problem with the underlying logical grid approach of controlling navigation is that with actual EPG grids from commonly occu
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