cosmetic changes

grammar.js

@@ -30,10 +30,10 @@ module.exports = grammar({
         $._end
       ),
 
-    label: ($) => choice($.string, $._unquoted_string),
-
     identifier: ($) => $._identifier,
 
+    label: ($) => choice($.string, $._unquoted_string),
+
     attr_value: ($) => choice($.string, $._unquoted_string),
 
     _root_attribute: ($) =>

src/grammar.json

@@ -167,6 +167,10 @@
         }
       ]
     },
+    "identifier": {
+      "type": "SYMBOL",
+      "name": "_identifier"
+    },
     "label": {
       "type": "CHOICE",
       "members": [
@@ -180,10 +184,6 @@
         }
       ]
     },
-    "identifier": {
-      "type": "SYMBOL",
-      "name": "_identifier"
-    },
     "attr_value": {
       "type": "CHOICE",
       "members": [