No need for rules if no rules have filter

examples/gml.js

@@ -7,7 +7,7 @@ goog.require('ol.parser.ogc.GML_v3');
 goog.require('ol.source.MapQuestOpenAerial');
 goog.require('ol.source.Vector');
 goog.require('ol.style.Fill');
-goog.require('ol.style.Rule');
+goog.require('ol.style.Stroke');
 goog.require('ol.style.Style');
 
 var raster = new ol.layer.TileLayer({
@@ -19,15 +19,17 @@ var vector = new ol.layer.Vector({
     parser: new ol.parser.ogc.GML_v3(),
     url: 'data/gml/topp-states-wfs.xml'
   }),
-  style: new ol.style.Style({rules: [
-    new ol.style.Rule({
-      symbolizers: [
-        new ol.style.Fill({
-          color: '#bada55'
-        })
-      ]
-    })
-  ]})
+  style: new ol.style.Style({
+    symbolizers: [
+      new ol.style.Fill({
+        color: '#ffffff',
+        opacity: 0.25
+      }),
+      new ol.style.Stroke({
+        color: '#6666ff'
+      })
+    ]
+  })
 });
 
 var map = new ol.Map({
@@ -35,7 +37,7 @@ var map = new ol.Map({
   renderer: ol.RendererHint.CANVAS,
   target: 'map',
   view: new ol.View2D({
-    center: [-10997171.194994785, 5206335.565590534],
+    center: [-10997171, 4658434],
     zoom: 4
   })
 });