PROV: add semantic metrics
Semantic changes should be written down as triples:
lokievent:{event}_{$page}_{$newRev} loki:classesChange "{$val}"; # TODO: how many [category:] statements were added/removed (+/-) loki:relationsChange "{$val}"; # TODO: how many relation (to other pages)... loki:attributesChange "{$val}"; # TODO: how many attributes (to literals)... loki:statementsChange "{$val}"; # TODO: how many ALL statements...
compare_temp_semantic_data function from commit https://gitlab.geist.re/pro/loki/commit/39e4424eda4c1d38e7ad53da761fbd338795f4f1 may be useful