摘要: Managing scientific data requires tools that can track complex provenance information about digital resources and workflows. RDF triples are a convenient abstraction for combining independently-generated factual statements, including statements provenance[1]. Harvesting is strategy asynchronously acquiring distributed the purposes of aggregation analysis[2]. typically be temporally scoped attributed to some creator or source. An triple asserts fact without attributing it any actor period time, so must extended support typical harvesting scenarios. This paper compares standard, conventional, non-standard means extending associate them with attribution timing information. Then, considers implications these techniques presents implementation sketches based on journaling strategy.