| http://www.w3.org/ns/prov#value | - res the direction of an entity at a time-step to be undefined, because at a time-step an entity might change its direction (for more details see [14]).Figure 4: : angle of entity at a time-point .The front region of an entity is a region associated with at a time-point , where , , , which represents the perception region of an entity, for example, a visual or an auditive range.
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