Enum Cardinality 

pub enum Cardinality {
    Functional,
    SetValued,
    Unknown,
}

Cardinality of the (subject, predicate) subject-line — always a caller proposal; the gate decides.

Unknown is the default and routes to the non-destructive branch. The engine treats the caller’s cardinality hint as advisory: if evidence is insufficient, it surfaces to the oracle.

Variants

Functional

At most one value is valid at a time. Bounding a new value supersedes prior.

SetValued

Multiple simultaneous values are valid. Bounding requires explicit negative assertion.

Unknown

Default. Routes to non-destructive path + surfaces to oracle.

Trait Implementations

impl Clone for Cardinality

fn clone(&self) -> Cardinality

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Cardinality

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

Formats the value using the given formatter.

impl Default for Cardinality

fn default() -> Cardinality

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Cardinality

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for Cardinality

impl PartialEq for Cardinality

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for Cardinality

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Cardinality