Registry for structure pieces

src/main/java/com/volmit/iris/util/RegistryListStructurePiece.java

@@ -0,0 +1,14 @@
+package com.volmit.iris.util;
+
+import static java.lang.annotation.ElementType.*;
+import static java.lang.annotation.RetentionPolicy.*;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.Target;
+
+@Retention(RUNTIME)
+@Target({PARAMETER, TYPE, FIELD})
+public @interface RegistryListStructure
+{
+
+}