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<h4 class="subsection">8.2.5 Consistency and Elaboration</h4>
<p>A library unit is consistent if the same version of its declaration is
used in all units that reference it. This requirement applies as well to
a unit that is referenced in several partitions of a distributed
program. If a shared passive or RCI library unit U is included in some
partition P, It is a bounded error to elaborate another partition P1 of
a distributed program that that depends on a different version of U. As
a result of this error, Program_Error can be raised in one or both
partitions during elaboration.
</p>
<p>U’Version yields a string that identifies the version of the unit
declaration and any unit declaration on which it depends. U’Version_Body
yields a string that identifies the version of the unit body. These
attributes are used by the PCS to verify the consistency of an
application.
</p>
<p>After elaborating the library units, but prior to invoking the main
subprogram, the PCS checks the RCI unit versions, and then accept any
incoming RPC. To guarantee that it is safe to call receiving stubs, any
incoming RPC is kept pending until the partition completes its
elaboration.
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