MECE principle

[WolfgangFahl]

Lex Sulzer just mentioned https://en.wikipedia.org/wiki/MECE_principle in his EMW Con 2021 talk and I think we might want to apply it to our data sources. It might help us to avoid redundancy. We 'd apply the principle as:

Do not cut& paste data that is available elsewhere online.

See #162 for the different sources like dblp, wikidata and wikicfp.

See #166 for a redundancy problem.

[WolfgangFahl]

Applying the Blackboard pattern would allow us to follow the MECE principle better.