Resolve inheritance between identified records

lifecycle.go

@@ -18,7 +18,9 @@ type Definition[T any] struct {
 	// SequenceCompositions registers mapping paths whose sequence contributions
 	// strictly append distinct records by the selected literal identity field.
 	// Invalid or conflicting registrations fail option validation. Repeated input
-	// identities fail strict composition after source and helper processing.
+	// identities fail strict composition after source and helper processing. The
+	// field also supplies identity for parent lookup when surviving records at
+	// that path use record-inheritance directives.
 	// Registration paths are copied when a load begins; definitions are read-only
 	// after being shared.
 	SequenceCompositions []SequenceComposition
@@ -46,6 +48,7 @@ type SequenceComposition struct {
 	Path Path
 	// IdentityField is one literal mapping key and may be empty. Records must
 	// contain a string at this key; malformed records fail strict composition.
+	// The field also identifies parents for record inheritance at this path.
 	IdentityField string
 }