is a message predicate. This is added to the message by the BizTalk engine to restrict message routing to only those hosts ...

{0} is a message predicate.  This is added to the message by the BizTalk engine to restrict message routing to only those hosts that have the appropriate corresponding property available.  This is mainly used in the case of inbound encrypted messages, where the host must have the decryption certificate associated with it to receive the message.
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