restructer and move to esdoc

src/Util/ID/RootID.js

@@ -0,0 +1,21 @@
+import { getReference } from './structReferences.js'
+
+export const RootFakeUserID = 0xFFFFFF
+
+export default class RootID {
+  constructor (name, typeConstructor) {
+    this.user = RootFakeUserID
+    this.name = name
+    this.type = getReference(typeConstructor)
+  }
+  equals (id) {
+    return id !== null && id.user === this.user && id.name === this.name && id.type === this.type
+  }
+  lessThan (id) {
+    if (id.constructor === RootID) {
+      return this.user < id.user || (this.user === id.user && (this.name < id.name || (this.name === id.name && this.type < id.type)))
+    } else {
+      return true
+    }
+  }
+}