diff --git a/src/Symfony/Component/Routing/Loader/schema/routing/routing-1.0.xsd b/src/Symfony/Component/Routing/Loader/schema/routing/routing-1.0.xsd
index 5346237edb..c9bd3d6a6d 100644
--- a/src/Symfony/Component/Routing/Loader/schema/routing/routing-1.0.xsd
+++ b/src/Symfony/Component/Routing/Loader/schema/routing/routing-1.0.xsd
@@ -43,7 +43,7 @@
   <xsd:complexType name="import">
     <xsd:group ref="configs" minOccurs="0" maxOccurs="unbounded" />
 
-    <xsd:attribute name="resource" type="xsd:string" />
+    <xsd:attribute name="resource" type="xsd:string" use="required" />
     <xsd:attribute name="type" type="xsd:string" />
     <xsd:attribute name="prefix" type="xsd:string" />
     <xsd:attribute name="hostname-pattern" type="xsd:string" />
@@ -52,7 +52,7 @@
   <xsd:complexType name="element">
     <xsd:simpleContent>
       <xsd:extension base="xsd:string">
-        <xsd:attribute name="key" type="xsd:string" />
+        <xsd:attribute name="key" type="xsd:string" use="required" />
       </xsd:extension>
     </xsd:simpleContent>
   </xsd:complexType>