If this key is included and the value is truthy, this update is an agreement. The value may include serialisable proof that applicable agreement conditions have been met, such as a key to a ledger entry.
Partial subjects, containing properties that have been deleted from the domain. Note that deletion of a property (even of all properties) does not necessarily indicate that the subject's identity is not longer represented in the domain.
Partial subjects, containing properties that have been inserted into the domain.
An identified security principal (user or machine) that is responsible for this update.
Partial subjects, containing only properties with a SharedDatatype
in the domain, which have been operated on. Subject property values under
this key will typically be inline constraint expressions using mutation
operators like @plus, which must be interpreted by the receiving code.
Note that most data changes appear as combinations of @delete and
@insert, even if the original user update used the @update keyword,
because most data in the domain comprises atomic immutable values which are
updated by replacement. Shared data types, in contrast, are mutable and
their updates can only be provided using expressions.
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An update that has cleared preliminary checks and been assigned metadata, but has not yet been signalled to the application. Available to triggered rules like constraints and agreement conditions.