diff --git a/errata/base_types.xsd b/errata/base_types.xsd
index c499936..c7a4777 100644
--- a/errata/base_types.xsd
+++ b/errata/base_types.xsd
@@ -18,4 +18,11 @@
 		</xs:restriction>
 	</xs:simpleType><!-- Number_of_bytes -->
 
+	<xs:simpleType name="Session_label">
+		<xs:restriction base="xs:string">
+			<xs:minLength value="0"/>
+			<xs:maxLength value="160"/>
+		</xs:restriction>
+	</xs:simpleType><!-- Session_label -->
+
 </xs:schema>
diff --git a/errata/runtime.xsd b/errata/runtime.xsd
index adedbc1..b849589 100644
--- a/errata/runtime.xsd
+++ b/errata/runtime.xsd
@@ -3,20 +3,26 @@
 
  <xs:include schemaLocation="base_types.xsd"/>
 
+ <xs:complexType name="template_service">
+  <xs:choice minOccurs="0" maxOccurs="unbounded"/>
+  <xs:attribute name="label" type="Session_label" />
+ </xs:complexType>
+
  <xs:complexType name="template_services">
   <xs:choice minOccurs="0" maxOccurs="unbounded">
-   <xs:element name="audio_in">    <xs:complexType/> </xs:element>
-   <xs:element name="audio_out">   <xs:complexType/> </xs:element>
-   <xs:element name="block">       <xs:complexType/> </xs:element>
-   <xs:element name="file_system"> <xs:complexType/> </xs:element>
-   <xs:element name="framebuffer"> <xs:complexType/> </xs:element>
-   <xs:element name="input">       <xs:complexType/> </xs:element>
-   <xs:element name="log">         <xs:complexType/> </xs:element>
-   <xs:element name="nic">         <xs:complexType/> </xs:element>
-   <xs:element name="nitpicker">   <xs:complexType/> </xs:element>
-   <xs:element name="report">      <xs:complexType/> </xs:element>
-   <xs:element name="rom">         <xs:complexType/> </xs:element>
-   <xs:element name="terminal">    <xs:complexType/> </xs:element>
+   <xs:element name="audio_in" type="template_service"/>
+   <xs:element name="audio_out" type="template_service"/>
+   <xs:element name="block" type="template_service"/>
+   <xs:element name="file_system" type="template_service"/>
+   <xs:element name="framebuffer" type="template_service"/>
+   <xs:element name="input" type="template_service"/>
+   <xs:element name="log" type="template_service"/>
+   <xs:element name="nic" type="template_service"/>
+   <xs:element name="nitpicker" type="template_service"/>
+   <xs:element name="report" type="template_service"/>
+   <xs:element name="rom" type="template_service"/>
+   <xs:element name="rtc" type="template_service"/>
+   <xs:element name="terminal" type="template_service"/>
   </xs:choice>
  </xs:complexType>