Setting Up Contracts for Communication
You use contracts to specify which messages can flow from which endpoints to which queues. Two T-SQL keywords come into play here:
INITIATOR—This service begins a messaging conversion.
TARGET—This service engages in (or accepts) conversions with an initiator.
As described earlier, the sample system is initiated by a stored procedure in AdventureWorks2012 that sends a message of type CatalogChangeMessage to a queue in XCatMgmt. Every CatalogChangeMessage is thus sent by a conversation initiator.
The catalog ...
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