internal

type Aspect struct {
	Name, Spec string
	Kinds      []string
	Traits     []Trait
}

type Kind struct {
	Name, Path, Spec string
	Props            []Prop // newly introduced fields, or fields with new default values
	Nouns            []string
}

type Noun struct {
	Name, Kind, Spec string
	Props            []Prop
	Relations        []string // list of relations involving the noun
}

type Pair struct {
	First, Second string
}

type Pairing struct {
	Rel   *Relation
	Pairs []*Pair
}

type Prop struct {
	Name, Value string
	Spec        sql.NullString
}

type Relation struct {
	Name, Kind, Cardinality, OtherKind, Spec string
}

type Trait struct {
	Name, Spec string
}