*Lifecycle* extension also specifies a standard transactional model for activities.]{}

Organizational

:   [Specifies three attributes for events, which identify the actor having caused the event (attribute ’Organizational:resource’), his role in the organization (attribute ’Organizational:role’), and the group or department within the organization where he is located (attribute ’Organizational:group’).]{}

Time

:   [Specifies the date and time at which an event occurred (attribute ’Time:timestamp’).]{}

Semantic

:   [Allows definition of an activity meta-model that specifies higher-level aggregate views on events (attribute ’Semantic:modelReference’).]{}

![XES event log meta-model, as defined in [@Gunther2014].[]{data-label="fig:XES_metamodel"}](XES_metamodel){width="0.95\linewidth"}

We introduce a special attribute of type *String* with key *label*, which represents a high-level version of the generally understood name of an event. The *concept* name of a event is then considered to be a low-level name of an event. The *Semantic* extension closely resembles the *label* attribute, however, by specifying relations between low-level and high-level events in a meta-model, the *Semantic* extension assumes that all instances of a low-level event type belong to the same high-level event type. The *label* attribute specifies the high-level label for each event individually, allowing for example one low-level event of low-level type *Dishes & cups cabinet* to be of high-level type *Taking medicine*, and another 