diff --git a/src/Enumerators/SchemaFieldExistence.php b/src/Enumerators/SchemaFieldExistence.php
new file mode 100644
index 0000000..8a35583
--- /dev/null
+++ b/src/Enumerators/SchemaFieldExistence.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace Darksparrow\DeegraphPHP\Enumerators;
+
+enum SchemaFieldExistence: string
+{
+    case MUST = "MUST";
+    case SHOULD = "SHOULD";
+    case MAY = "MAY";
+}