diff --git a/message/set.go b/message/set.go
deleted file mode 100644
index 3c2326e..0000000
--- a/message/set.go
+++ /dev/null
@@ -1,28 +0,0 @@
-package message
-
-import (
-	"github.com/dogmatiq/dogma"
-	"github.com/dogmatiq/enginekit/collections/sets"
-)
-
-// NamesOf returns a name set containing the names of the given messages.
-func NamesOf(messages ...dogma.Message) *sets.Set[Name] {
-	names := &sets.Set[Name]{}
-
-	for _, m := range messages {
-		names.Add(NameOf(m))
-	}
-
-	return names
-}
-
-// TypesOf returns a type set containing the types of the given messages.
-func TypesOf(messages ...dogma.Message) *sets.Set[Type] {
-	types := &sets.Set[Type]{}
-
-	for _, m := range messages {
-		types.Add(TypeOf(m))
-	}
-
-	return types
-}
diff --git a/message/set_test.go b/message/set_test.go
deleted file mode 100644
index 76967be..0000000
--- a/message/set_test.go
+++ /dev/null
@@ -1,27 +0,0 @@
-package message_test
-
-import (
-	"testing"
-
-	. "github.com/dogmatiq/configkit/message"
-	"github.com/dogmatiq/enginekit/collections/sets"
-	. "github.com/dogmatiq/enginekit/enginetest/stubs"
-)
-
-func TestNamesOf(t *testing.T) {
-	got := NamesOf(CommandA1, EventA1)
-	want := sets.New(NameOf(CommandA1), NameOf(EventA1))
-
-	if !got.IsEqual(want) {
-		t.Fatalf("unexpected result: got %v, want %v", got, want)
-	}
-}
-
-func TestTypesOf(t *testing.T) {
-	got := TypesOf(CommandA1, EventA1)
-	want := sets.New(TypeOf(CommandA1), TypeOf(EventA1))
-
-	if !got.IsEqual(want) {
-		t.Fatalf("unexpected result: got %v, want %v", got, want)
-	}
-}