How do the implementations of SSSOM handle competing mappings?

[allenbaron]

If two subject_id-predicate_id-object_id mappings are created and one has predicate_modifier=Not, how do SSSOM implementations handle that?

Is this something that's in, or should be in, the spec?

[matentzn]

Its a good question. This is not done very well; and is certainly not documented.

sssom-py has a non-canonical highly opinionated implementation of this using the --reconcile parameter, see https://mapping-commons.github.io/sssom-py/cli/commands/#sssom-merge.

[gouttegd]

SSSOM-Java does not do anything particular in this case, because there is nothing to do.

It’s just two mapping records with different data for the same subject/predicate/object (SPO) triple. Perfectly valid as far as SSSOM is concerned. If this is a problem, then it’s up to the user to sort out the mess.