| http://www.w3.org/ns/prov#value | - In a scheme such as this, it is impossible for data to flow in the opposite direction, so that, for example, Stage C cannot pass data to Stage A. This restriction is often perfectly acceptable. [0379] On the other hand, it is very desirable for Stage A to be able to communicate information to Stage C even though there is no direct connection between the two blocks.
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