This assignment is the type description for the community concept, as indicated in the publication referenced in commClass.classPublication_ID (NOT the commAuthority_ID of this commInterpretation table).
This is the lower limit, in percent, associated with a specific coverCode. Where a cover scale has a non-quantitative lower or upper value, as in the "+" of the Braun-Blanquet scale, it is necessary to provide an approximation with "0" being the lower limit of the bottom most class.
A middle value (usually mean or geometric mean) between the upperLimit and lowerLimt stored by the database for each taxon observation and used for all coverclass conversions and interpretations. This is assigned by the author of the cover class schema.