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There are times when the parameter values for the simple requests in a batch request are the
same, for example,
ItemType=ASIN. In this case, instead of using a ReferenceNumber for
each simple request, you can substitute the special value, "Shared,", as shown in the
The following parameter declarations show the equivalent of the preceding declaration.
Both forms of the request work but using the special value, Shared, reduces the amount of typing required. Generally, you only use the Shared value with required parameters. Optional parameters do not need to be included in the request and their default values, if any, are assumed and thus shared across the simple requests in the batch request.