Index: trunk/data/validator/deprecated.mapcss
===================================================================
--- trunk/data/validator/deprecated.mapcss	(revision 9794)
+++ trunk/data/validator/deprecated.mapcss	(revision 9835)
@@ -792,2 +792,9 @@
   throwWarning: tr("questionable key (ending with a number): {0}", "{0.key}");
 }
+
+/* #12500 */
+*[sport=skating] {
+  throwWarning: tr("{0} is deprecated", "{0.tag}");
+  suggestAlternative: "sport=ice_skating";
+  suggestAlternative: "sport=roller_skating";
+}