The identifier for this specification is: https://identifiers.org/combine.specifications:sbgn-er
The SBGN Entity Relationship (ER) language allows you to see all the relationships in which a given entity participates, regardless of the temporal aspects. Relationships can be seen as rules describing the influences of entities nodes on other relationships.
The last specifications of SBGN ER is SBGN ER Level 1 Version 1.2.