implementations of networked RDF store replication, please?

	I wonder, are there any software packages to facilitate RDF
	store replication over the network?

	Basically, there're to be RDF stores A and B, which both are to
	be continually updated (predominantly, new triples are added.)
	I'm looking for a software package which would allow for the
	updates to propagate to the other store in a timely (in the
	matter of minutes) manner.

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FSF associate member #7257