In order to clarify my previous email I have prepared this functional taxonomy of the elements that in my opinion form an item:
Meta + Labels -- Multilingual main label (no sources, no qualifiers) -- Multilingual alternative labels (no sources, no qualifiers) -- Multilingual historic/alternative labels (will be possible with monolingual datatype+qualifiers) -- External identifiers (currently treated as statements) -- Sitelinks (how each project calls the concept) + Metainformation -- Concept taxonomy (part of/ subclass of) -- Concept life-cycle (sometimes irrelevant, other times expressed with start/end date, no deprecation possible) -- Concept precedence (possible to express as statements "succeeded by"/"preceded by", but perhaps needs disambiguation from content) -- Concept dependence (endemic to, bound to [experience/cognition/etc], recognition methods, etc) -- Source for the concept (not defined, sometimes irrelevant)
Content + Current information -- Statements + Historic information -- Deprecated statements + Open data information -- Related to outcome on RFC about open datasets