Enum Constraint 

pub enum Constraint {
    Enum {
        values: Vec<Term>,
        closed: bool,
    },
    Reference {
        relation: String,
        cardinality: Cardinality,
        spanning: bool,
    },
}

A value constraint on a field.

Variants

Enum

A controlled vocabulary — an enumerated set of allowed values.

Fields

values: Vec<Term>

The legal terms.

closed: bool

true: an unknown value is rejected. false: allowed, near-misses warn.

Reference

A relation / link field. The spanning (containment) backbone lives here.

Fields

relation: String

The relation name (contents, part_of, …).

cardinality: Cardinality

Single link vs a list of links.

spanning: bool

The spanning containment relation (the discovery backbone).

Trait Implementations

impl Clone for Constraint

fn clone(&self) -> Constraint

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Constraint

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

Formats the value using the given formatter.

impl Validate for Constraint

fn validate(&self, value: &Value) -> Validation

Only a controlled vocabulary constrains scalar values here; a reference or a type-only rule imposes nothing (fig’s reparse remains the backstop).