| http://www.w3.org/ns/prov#value | - signal 54 at its output if the following requirements are met: firstly, that a bottle, or other article under observation, is, in fact, being detected during a given period of detection; secondly, that a complete bottle and not more or less than one bottle is being detected; and thirdly, that an abnormality such as a birdswing is detected.
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