UC3 - note on Qualified Relation pattern

I added a note and link from UC3 to the Qualified Relation pattern - antecedent or model for the PROV-O QualifiedAttribution class.
https://www.w3.org/2017/dxwg/wiki/Use_Cases_and_Requirements#Existing_approaches_2

Simon J D Cox
Research Scientist
Environmental Informatics
CSIRO Land and Water<http://www.csiro.au/Research/LWF>

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