Index: trunk/data/validator/geometry.mapcss
===================================================================
--- trunk/data/validator/geometry.mapcss	(revision 6719)
+++ trunk/data/validator/geometry.mapcss	(revision 6759)
@@ -58,2 +58,5 @@
   throwWarning: tr("{0} inside {1}", concat("shop=", tag("shop")), concat("shop=", tag("shop")));
 }
+node[tag("power") = parent_tag("power")] ∈ *[power] {
+  throwWarning: tr("{0} inside {1}", concat("power=", tag("power")), concat("power=", tag("power")));
+}