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"They [producer and consumer] may have other considerations, such as field length, that are affected by the insertion of additional controls or markup".
"a dedicated system with an interface that allows base direction to be specified during input "
If my understanding is correct, I suggest to add something like "See §4.2", at the end of the sentence "Even if no action is taken by the producer, the consumer must decide what rules to follow in order to decide on the appropriate base direction/language." in section 2.3 "Decoding information". Indeed, this section is about to decode the [producer] information since "the consumer of the string [has to] understand how the producer did". So, the sentence might seem a little out of context.