diff --git a/lib/src/graph.dart b/lib/src/graph.dart
index fed40e7..11fad58 100644
--- a/lib/src/graph.dart
+++ b/lib/src/graph.dart
@@ -70,11 +70,8 @@ enum OkfGraphResolution {
 
   const OkfGraphResolution(this.wireValue);
 
-  /// Stable JSON representation.
-  final String wireValue;
-
   /// Parses the stable JSON representation.
-  static OkfGraphResolution fromWireValue(String value) {
+  factory OkfGraphResolution.fromWireValue(String value) {
     for (final resolution in values) {
       if (resolution.wireValue == value) {
         return resolution;
@@ -82,6 +79,9 @@ enum OkfGraphResolution {
     }
     throw FormatException('Unknown graph resolution', value);
   }
+
+  /// Stable JSON representation.
+  final String wireValue;
 }
 
 /// Composable filters for constructing an [OkfGraph].
diff --git a/lib/src/metadata.dart b/lib/src/metadata.dart
index 60e01c0..75e3769 100644
--- a/lib/src/metadata.dart
+++ b/lib/src/metadata.dart
@@ -55,10 +55,7 @@ enum OkfLifecycleStatus {
 
   const OkfLifecycleStatus(this.wireValue);
 
-  /// The stable lowercase representation.
-  final String wireValue;
-
-  static OkfLifecycleStatus _parse(String? value) {
+  factory OkfLifecycleStatus._parse(String? value) {
     switch (value?.trim().toLowerCase()) {
       case null:
       case '':
@@ -72,6 +69,9 @@ enum OkfLifecycleStatus {
         return unknown;
     }
   }
+
+  /// The stable lowercase representation.
+  final String wireValue;
 }
 
 /// A date range framing one or more source usage counts.