  Object-Centric Event Logs (OCELs) form the basis for Object-Centric Process
Mining (OCPM). OCEL 1.0 was first released in 2020 and triggered the
development of a range of OCPM techniques. OCEL 2.0 forms the new, more
expressive standard, allowing for more extensive process analyses while
remaining in an easily exchangeable format. In contrast to the first OCEL
standard, it can depict changes in objects, provide information on object
relationships, and qualify these relationships to other objects or specific
events. Compared to XES, it is more expressive, less complicated, and better
readable. OCEL 2.0 offers three exchange formats: a relational database
(SQLite), XML, and JSON format. This OCEL 2.0 specification document provides
an introduction to the standard, its metamodel, and its exchange formats, aimed
at practitioners and researchers alike.
