In heterogeneous environment, data provenance information in ETL is represented on the basis of OPM.However,there is still a lack of consensus on conceptual representation of ETL provenance information,usage of provenance vocabulary and a consolidated access mode.A unified provenance representation mechanism,which was based on PROV,was proposed for ETL.Firstly,it presented a concept representation mechanism for ETL,which demonstrated primary provenance concepts and their relationships.Secondly,it constructed a multi-granularity vocabulary to fulfill the requirement of expressing provenance information on different abstraction levels.Finally,a standard access mode was proposed in which provenance information was organized into two levels,the bottom one was described with RDF,and the above level was formed based on query of the former.
