One turn in a task's conversation: who said it, when, and what they said. Both people and machine actors (harness graphs, decision-support rules) author turns. Because R4 does not permit Device as an Annotation.author target and a profile cannot widen it, a machine-authored turn is an identifier-only logical reference under the nexus-harness-graph or nexus-cds-rule NamingSystem, carrying a display and no literal reference; the identifier's system is what says the author is a graph. Human authors use the element normally.
Invariants
Every rule in force on a conforming instance. This profile rows are stated here; inherited rows come from the base resource and are listed so that a constraint named on an element is findable. Invariant keys elsewhere on this page link into this table.
Key
Source
Severity
On
Rule
nexus-note-agent-author
this profile
error
Annotation
A turn authored by a machine actor SHALL be an identifier-only logical reference: author.identifier under the nexus-harness-graph or nexus-cds-rule NamingSystem, carrying a display and NO literal reference. Device is not an allowed target of Annotation.author in R4, so the identifier system carries the identity; Reference.type is omitted deliberately rather than asserting a target the element does not permit. author.ofType(Reference).identifier.where(system = '../NamingSystem/nexus-harness-graph' or system = '../NamingSystem/nexus-cds-rule').exists() implies (author.ofType(Reference).reference.empty() and author.ofType(Reference).type.empty() and author.ofType(Reference).display.exists() and author.ofType(Reference).identifier.value.exists())
ele-1
inherited
error
Annotation
All FHIR elements must have a @value or children hasValue() or (children().count() > id.count())
ext-1
inherited
error
Annotation.extension
Must have either extensions or value[x], not both extension.exists() != value.exists()