diff --git a/Resources/config/schema/api_doc.xsd b/Resources/config/schema/api_doc.xsd
index 66f36a9..b8c97ab 100644
--- a/Resources/config/schema/api_doc.xsd
+++ b/Resources/config/schema/api_doc.xsd
@@ -6,37 +6,31 @@
 
     <xsd:element name="config">
         <xsd:complexType>
-            <xsd:sequence>
-                <xsd:element name="name" type="xsd:string" minOccurs="0" maxOccurs="1"/>
+            <xsd:all>
                 <xsd:element name="motd" type="motd" minOccurs="0" maxOccurs="1"/>
                 <xsd:element name="request_listener" type="request_listener" minOccurs="0" maxOccurs="1"/>
                 <xsd:element name="sandbox" type="sandbox" minOccurs="0" maxOccurs="1"/>
-            </xsd:sequence>
+            </xsd:all>
+            <xsd:attribute name="name" type="xsd:string"/>
         </xsd:complexType>
     </xsd:element>
 
     <xsd:complexType name="motd">
-        <xsd:sequence>
-            <xsd:element name="template" type="xsd:string" minOccurs="0" maxOccurs="1"/>
-        </xsd:sequence>
+        <xsd:attribute name="template" type="xsd:string"/>
     </xsd:complexType>
 
     <xsd:complexType name="request_listener">
-        <xsd:sequence>
-            <xsd:element name="enabled" default="true" type="xsd:boolean" minOccurs="0" maxOccurs="1"/>
-            <xsd:element name="parameter" default="_doc" type="xsd:string" minOccurs="0" maxOccurs="1"/>
-        </xsd:sequence>
+        <xsd:attribute name="enabled" default="true" type="xsd:boolean"/>
+        <xsd:attribute name="parameter" default="_doc" type="xsd:string"/>
     </xsd:complexType>
 
     <xsd:complexType name="sandbox">
-        <xsd:sequence>
-            <xsd:element name="enabled" default="true" type="xsd:boolean" minOccurs="0" maxOccurs="1"/>
-            <xsd:element name="endpoint" nillable="true" type="xsd:string" minOccurs="0" maxOccurs="1"/>
-            <xsd:element name="accept_type" type="xsd:string" minOccurs="0" maxOccurs="1"/>
-            <xsd:element name="body_format" type="body_format_enum" minOccurs="0" maxOccurs="1"/>
-            <xsd:element name="request_format" type="request_format" minOccurs="0" maxOccurs="1"/>
-            <xsd:element name="authentication" type="authentication" minOccurs="0" maxOccurs="1"/>
-        </xsd:sequence>
+        <xsd:attribute name="enabled" default="true" type="xsd:boolean"/>
+        <xsd:attribute name="endpoint" type="xsd:string"/>
+        <xsd:attribute name="accept_type" type="xsd:string"/>
+        <xsd:attribute name="body_format" type="body_format_enum"/>
+        <xsd:attribute name="request_format" type="request_format"/>
+        <xsd:attribute name="authentication" type="authentication"/>
     </xsd:complexType>
 
     <xsd:simpleType name="body_format_enum">
@@ -47,10 +41,8 @@
     </xsd:simpleType>
 
     <xsd:complexType name="request_format">
-        <xsd:sequence>
-            <xsd:element name="method" type="request_format_method_enum" minOccurs="0" maxOccurs="1"/>
-            <xsd:element name="default_format" type="request_format_default_format_enum" minOccurs="0" maxOccurs="1"/>
-        </xsd:sequence>
+        <xsd:attribute name="method" type="request_format_method_enum"/>
+        <xsd:attribute name="default_format" type="request_format_default_format_enum"/>
     </xsd:complexType>
 
     <xsd:simpleType name="request_format_method_enum">
@@ -68,11 +60,9 @@
     </xsd:simpleType>
     
     <xsd:complexType name="authentication">
-        <xsd:sequence>
-            <xsd:element name="name" type="xsd:string" maxOccurs="1"/>
-            <xsd:element name="delivery" type="authentication_delivery_enum" maxOccurs="1"/>
-            <xsd:element name="custom_endpoint" type="xsd:boolean" default="false" minOccurs="0" maxOccurs="1"/>
-        </xsd:sequence>
+        <xsd:attribute name="name" type="xsd:string"/>
+        <xsd:attribute name="delivery" type="authentication_delivery_enum"/>
+        <xsd:attribute name="custom_endpoint" type="xsd:boolean" default="false"/>
     </xsd:complexType>
 
     <xsd:simpleType name="authentication_delivery_enum">