rdf - triplestore with revisions -

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i need store rdf triples, while keeping track of modifications. there out there service? alternatively, how keep track of revision while using context-aware triplestore ?

edit: please note don't need changeset. need see triples @ time in past.

i tried address sort of thing storing additional triples describing said what, when. need reification, named graphs, or quads can ruin decidability.


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