Struct ExternalContext 

pub struct ExternalContext {
    pub dataset_id: Option<String>,
    pub lineage: ExternalLineage,
    pub origin: ExternalOrigin,
    pub source: String,
}

A typed, externally-supplied context record, stored beside the field.

Every field is optional except the origin and the (advisory) source label, so a caller can attach only the facts it actually holds rather than inventing the rest.

Fields

dataset_id: Option<String>

The dataset the document belongs to (e.g. real100-v1).

lineage: ExternalLineage

The external lineage tuple.

origin: ExternalOrigin

Where the facts came from.

source: String

A human-readable provenance label (e.g. the manifest path or row).

Implementations

impl ExternalContext

pub fn encode_canonical(&self) -> Vec<u8>

Canonical, self-describing encoding.

pub fn decode_canonical(bytes: &[u8]) -> Result<ExternalContext>

Parse a canonical external-context record, failing closed on any malformation rather than answering from a partially-understood record.

pub fn answer_json(&self) -> String

The typed answer body. The lineage tuple is named exactly as the C4b contract names it (family_id / member_id / is_head), so an answer can be compared to the baseline’s tuple without a projection.

Trait Implementations

impl Clone for ExternalContext

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ExternalContext

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for ExternalContext

impl PartialEq for ExternalContext

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for ExternalContext