Index: trunk/data/validator/deprecated.mapcss
===================================================================
--- trunk/data/validator/deprecated.mapcss	(revision 15270)
+++ trunk/data/validator/deprecated.mapcss	(revision 15273)
@@ -1739,2 +1739,11 @@
   fixAdd: "access=yes";
 }
+
+/* #17330 */
+*[crossing=island] {
+  throwWarning: tr("{0} is deprecated", "{0.tag}");
+  suggestAlternative: "crossing:island=yes";
+  group: tr("deprecated tagging");
+  fixRemove: "crossing";
+  fixAdd: "crossing:island=yes";
+}