Modeling 'direction' of evidence as a relationship vs an attribute of the evidence line

[mbrush]

SEPIO needs to be able to describe evidence 'direction' - to indicate when a particular line of evidence is supporting, refuting, or provides inconclusive information relative to a target assertion. The current SEPIO model captures this information via the relationship is used to link an assertion to an evidence line (has_supporting_evidence, has_refuting_evidence, has_inconclusive evidence).

An alternate approach is to describe directionality as an attribute of an EvidenceLine. Here we would create attribute terms (Supporting, Refuting, Inconclusive) that can be hung from an EvidenceLine to describe the direction of support it provides its target assertion.