Index: trunk/resources/data/validator/deprecated.mapcss
===================================================================
--- trunk/resources/data/validator/deprecated.mapcss	(revision 18519)
+++ trunk/resources/data/validator/deprecated.mapcss	(revision 18524)
@@ -2374,3 +2374,11 @@
 }
 
+/* #22120 */
+*[school=entrance] {
+  throwWarning: tr("{0} is deprecated", "{0.tag}");
+  suggestAlternative: "entrance=yes";
+  suggestAlternative: "entrance=main";
+  group: tr("deprecated tagging");
+}
+
 /* When tags are deprecated they should be added to ignoretags.cfg too. */