[provenance-challenge] {Disarmed} Draft proposal added for review

[Natalia Kwasnikowska]

Dear all,

Jan Van den Bussche and I have added a proposal for modelling multiple  
hierarchical refinements in OPM:
	http://twi​ki.ipaw.in​fo/bin/vie​w/OPM/Chan​geProposal​ 
MultipleHi​erarchical​Refinement

Best regards,

Natalia
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