Struct EntityMetadataSpec 

pub struct EntityMetadataSpec<'a> {
    pub id: EntityId<'a>,
    pub node_id: NodeId<'a>,
    pub kind: EntityKind,
    pub source_name: &'a str,
    pub type_name: &'static str,
    pub type_hash: &'static str,
    pub qos: QoSProfile,
}

Inputs for entity_metadata. Collapses the seven positional arguments — three of them adjacent &str (source_name / type_name / type_hash) that are trivially transposable at a call site — into one named-field struct. phase-308 — pub alongside MetadataRecorder::push_entity: metadata-mode adapters for other languages build entities through this ONE constructor so the defaults (and therefore the recorded shape) cannot diverge per language.

Fields

id: EntityId<'a>

node_id: NodeId<'a>

kind: EntityKind

source_name: &'a str

type_name: &'static str

type_hash: &'static str

qos: QoSProfile