Index: trunk/config/bwbuild/jboss-postgresql/cal.options.xml
===================================================================
--- trunk/config/bwbuild/jboss-postgresql/cal.options.xml (revision 3060)
+++ trunk/config/bwbuild/jboss-postgresql/cal.options.xml (revision 3103)
@@ -606,5 +606,5 @@
 
           <!-- Exchange sync callback. Comment out for no service -->
-          <exchangeWsPushURI>http://128.113.124.238:8080/exsynch/</exchangeWsPushURI>
+          <exchangeWsPushURI>http://128.113.124.164:8080/exsynch/</exchangeWsPushURI>
 
           <!-- Path to keystore - comment out to use default -->          
Index: trunk/resources/exsynchwsdefs/iCalendar-bw-extensions.xsd
===================================================================
--- trunk/resources/exsynchwsdefs/iCalendar-bw-extensions.xsd (revision 3055)
+++ trunk/resources/exsynchwsdefs/iCalendar-bw-extensions.xsd (revision 3103)
@@ -12,4 +12,8 @@
   <!-- ===================== Properties =================================  -->
   <xs:include schemaLocation="iCalendar-props.xsd" />
+
+  <xs:element name="x-bedework-cost" 
+              type="xcal:x-bw-costPropType"
+              substitutionGroup="xcal:base-property" />
 
   <xs:element name="x-bedework-exsynch-endtzid" 
@@ -28,4 +32,10 @@
               type="xcal:x-bw-exsynch-starttzidPropType"
               substitutionGroup="xcal:base-property" />
+  
+  <xs:complexType name="x-bw-costPropType">
+    <xs:complexContent mixed="false">
+      <xs:extension base="xcal:TextPropertyType"/>
+    </xs:complexContent>
+  </xs:complexType>
   
   <xs:complexType name="x-bw-exsynch-endtzidPropType">
Index: trunk/resources/exsynchwsdefs/iCalendar-params.xsd
===================================================================
--- trunk/resources/exsynchwsdefs/iCalendar-params.xsd (revision 3046)
+++ trunk/resources/exsynchwsdefs/iCalendar-params.xsd (revision 3103)
@@ -12,49 +12,132 @@
        3.2 Property parameter definitions
        ===================================================================== -->
-       
+
+  <xs:complexType name="BaseParameterType" abstract="true" >
+  </xs:complexType>
+
+  <xs:element name="base-parameter" type="xcal:BaseParameterType" />
+
   <xs:complexType name="ArrayOfParameters">
-    <xs:choice maxOccurs="unbounded">
-      <xs:element name="altrep" type="xcal:altrepParamType" />
-      <xs:element name="cn" type="xcal:cnParamType" />
-      <xs:element name="cutype" type="xcal:cutypeParamType" />
-      <xs:element name="delegated-from" type="xcal:delegated-fromParamType" />
-      <xs:element name="delegated-to" type="xcal:delegated-toParamType" />
-      <xs:element name="dir" type="xcal:dirParamType" />
-      <xs:element name="encoding" type="xcal:encodingParamType" />
-      <xs:element name="fmttype" type="xcal:fmttypeParamType" />
-      <xs:element name="fbtype" type="xcal:fbtypeParamType" />
-      <xs:element name="language" type="xcal:languageParamType" />
-      <xs:element name="member" type="xcal:memberParamType" />
-      <xs:element name="partstat" type="xcal:partstatParamType" />
-      <xs:element name="range" type="xcal:rangeParamType" />
-      <xs:element name="related" type="xcal:relatedParamType" />
-      <xs:element name="reltype" type="xcal:reltypeParamType" />
-      <xs:element name="role" type="xcal:roleParamType" />
-      <xs:element name="rsvp" type="xcal:rsvpParamType" />
-      <xs:element name="sent-by" type="xcal:sent-byParamType" />
-      <xs:element name="tzid" type="xcal:tzidParamType" />
-    </xs:choice>
-  </xs:complexType>
-  
-  <xs:complexType name="cal-addressListParamType">
     <xs:sequence>
-      <xs:element ref="xcal:cal-address" maxOccurs="unbounded"/>
+      <xs:element ref="xcal:base-parameter" maxOccurs="unbounded"/>
     </xs:sequence>
+  </xs:complexType>
+         
+  <!-- =====================================================================
+       Define all the standard properties. By using a substitutionGroup we
+       make it easy to extend the list of parameters. As an example see 
+       the parameters defined in iCalendar-caldavsched-extensions.xsd
+       ===================================================================== -->  
+
+  <xs:element name="altrep" type="xcal:altrepParamType"
+              substitutionGroup="xcal:base-parameter" />
+  <xs:element name="cn" type="xcal:cnParamType"
+              substitutionGroup="xcal:base-parameter" />
+  <xs:element name="cutype" type="xcal:cutypeParamType"
+              substitutionGroup="xcal:base-parameter" />
+  <xs:element name="delegated-from" type="xcal:delegated-fromParamType"
+              substitutionGroup="xcal:base-parameter" />
+  <xs:element name="delegated-to" type="xcal:delegated-toParamType"
+              substitutionGroup="xcal:base-parameter" />
+  <xs:element name="dir" type="xcal:dirParamType"
+              substitutionGroup="xcal:base-parameter" />
+  <xs:element name="encoding" type="xcal:encodingParamType"
+              substitutionGroup="xcal:base-parameter" />
+  <xs:element name="fmttype" type="xcal:fmttypeParamType"
+              substitutionGroup="xcal:base-parameter" />
+  <xs:element name="fbtype" type="xcal:fbtypeParamType"
+              substitutionGroup="xcal:base-parameter" />
+  <xs:element name="language" type="xcal:languageParamType"
+              substitutionGroup="xcal:base-parameter" />
+  <xs:element name="member" type="xcal:memberParamType"
+              substitutionGroup="xcal:base-parameter" />
+  <xs:element name="partstat" type="xcal:partstatParamType"
+              substitutionGroup="xcal:base-parameter" />
+  <xs:element name="range" type="xcal:rangeParamType"
+              substitutionGroup="xcal:base-parameter" />
+  <xs:element name="related" type="xcal:relatedParamType"
+              substitutionGroup="xcal:base-parameter" />
+  <xs:element name="reltype" type="xcal:reltypeParamType"
+              substitutionGroup="xcal:base-parameter" />
+  <xs:element name="role" type="xcal:roleParamType"
+              substitutionGroup="xcal:base-parameter" />
+  <xs:element name="rsvp" type="xcal:rsvpParamType"
+              substitutionGroup="xcal:base-parameter" />
+  <xs:element name="sent-by" type="xcal:sent-byParamType"
+              substitutionGroup="xcal:base-parameter" />
+  <xs:element name="tzid" type="xcal:tzidParamType"
+              substitutionGroup="xcal:base-parameter" />
+              
+  
+  <!-- Scheduling parameters for attendee or organizer -->
+  <xs:element name="schedule-agent" type="xcal:schedule-agentParamType"
+              substitutionGroup="xcal:base-parameter" />
+  <xs:element name="schedule-force-send" type="xcal:schedule-force-sendParamType"
+              substitutionGroup="xcal:base-parameter" />
+  <xs:element name="schedule-status" type="xcal:schedule-statusParamType"
+              substitutionGroup="xcal:base-parameter" />
+  
+  <!-- Bedework x-parameters -->
+  <xs:element name="x-bedework-uid" type="xcal:x-bedework-uidParamType" 
+              substitutionGroup="xcal:base-parameter" />
+  
+  <!-- Parameters that take a simple text value -->
+  <xs:complexType name="TextParameterType" >
+    <xs:complexContent mixed="false">
+      <xs:extension base="xcal:BaseParameterType">
+        <xs:sequence> 
+          <xs:element ref="xcal:text" />
+        </xs:sequence>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+  
+  <!-- Parameters that take a uri value -->
+  <xs:complexType name="UriParameterType" >
+    <xs:complexContent mixed="false">
+      <xs:extension base="xcal:BaseParameterType">
+        <xs:sequence>
+          <xs:element ref="xcal:uri"/>
+        </xs:sequence>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+  
+  <xs:complexType name="CalAddressListParamType">
+    <xs:complexContent mixed="false">
+      <xs:extension base="xcal:BaseParameterType">
+        <xs:sequence>
+          <xs:element ref="xcal:cal-address" maxOccurs="unbounded"/>
+        </xs:sequence>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+  
+  <xs:complexType name="CalAddressParamType">
+    <xs:complexContent mixed="false">
+      <xs:extension base="xcal:BaseParameterType">
+        <xs:sequence>
+          <xs:element ref="xcal:cal-address" />
+        </xs:sequence>
+      </xs:extension>
+    </xs:complexContent>
   </xs:complexType>
  
   <!-- 3.2.1 Alternate Text Representation -->
   <xs:complexType name="altrepParamType">
-    <xs:sequence>
-      <xs:element ref="xcal:uri"/>
-    </xs:sequence>
+    <xs:complexContent mixed="false">
+      <xs:extension base="xcal:UriParameterType"/>
+    </xs:complexContent>
   </xs:complexType>
   
   <!-- 3.2.2 Common Name -->
-  <xs:simpleType name="cnParamType">
-    <xs:restriction base="xs:string"/>
-  </xs:simpleType>
+  <xs:complexType name="cnParamType">
+    <xs:complexContent mixed="false">
+      <xs:extension base="xcal:TextParameterType"/>
+    </xs:complexContent>
+  </xs:complexType>
   
   <!-- 3.2.3 Calendar User Type -->
-  <xs:simpleType name="cutypeParamType">
+  <xs:simpleType name="cutypeValueType">
     <xs:restriction base="xs:token">
       <xs:enumeration value="INDIVIDUAL"/>
@@ -66,8 +149,19 @@
   </xs:simpleType>
   
+  <xs:complexType name="cutypeParamType">
+    <xs:complexContent mixed="false">
+      <xs:extension base="xcal:BaseParameterType">
+        <xs:sequence>
+          <xs:element name="text" type="xcal:cutypeValueType"/>
+        </xs:sequence>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+  
   <!-- 3.2.4 Delegators -->
   <xs:complexType name="delegated-fromParamType">
     <xs:complexContent mixed="false">
-      <xs:extension base="xcal:cal-addressListParamType"/>
+      <xs:extension base="xcal:CalAddressListParamType">
+      </xs:extension>
     </xs:complexContent>
   </xs:complexType>
@@ -76,5 +170,6 @@
   <xs:complexType name="delegated-toParamType">
     <xs:complexContent mixed="false">
-      <xs:extension base="xcal:cal-addressListParamType"/>
+      <xs:extension base="xcal:CalAddressListParamType">
+      </xs:extension>
     </xs:complexContent>
   </xs:complexType>
@@ -82,11 +177,11 @@
   <!-- 3.2.6 Directory Entry Reference -->
   <xs:complexType name="dirParamType">
-    <xs:sequence>
-      <xs:element ref="xcal:uri"/>
-    </xs:sequence>
+    <xs:complexContent mixed="false">
+      <xs:extension base="xcal:UriParameterType"/>
+    </xs:complexContent>
   </xs:complexType>
   
   <!-- 3.2.7 Inline Encoding -->
-  <xs:simpleType name="encodingParamType">
+  <xs:simpleType name="encodingValueType">
     <xs:restriction base="xs:token">
       <xs:enumeration value="8BIT"/>
@@ -95,11 +190,23 @@
   </xs:simpleType>
   
+  <xs:complexType name="encodingParamType">
+    <xs:complexContent mixed="false">
+      <xs:extension base="xcal:BaseParameterType">
+        <xs:sequence>
+          <xs:element name="text" type="xcal:encodingValueType"/>
+        </xs:sequence>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+  
   <!-- 3.2.8 Format Type -->
-  <xs:simpleType name="fmttypeParamType">
-    <xs:restriction base="xs:string"/>
-  </xs:simpleType>
+  <xs:complexType name="fmttypeParamType">
+    <xs:complexContent mixed="false">
+      <xs:extension base="xcal:TextParameterType"/>
+    </xs:complexContent>
+  </xs:complexType>
   
   <!-- 3.2.9 Free/Busy Time Type -->
-  <xs:simpleType name="fbtypeParamType">
+  <xs:simpleType name="fbtypeValueType">
     <xs:restriction base="xs:token">
       <xs:enumeration value="FREE"/>
@@ -110,18 +217,31 @@
   </xs:simpleType>
   
+  <xs:complexType name="fbtypeParamType">
+    <xs:complexContent mixed="false">
+      <xs:extension base="xcal:BaseParameterType">
+        <xs:sequence>
+          <xs:element name="text" type="xcal:fbtypeValueType"/>
+        </xs:sequence>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+  
   <!-- 3.2.10 Language -->
-  <xs:simpleType name="languageParamType">
-    <xs:restriction base="xs:string"/>
-  </xs:simpleType>
+  <xs:complexType name="languageParamType">
+    <xs:complexContent mixed="false">
+      <xs:extension base="xcal:TextParameterType"/>
+    </xs:complexContent>
+  </xs:complexType>
   
   <!-- 3.2.11 Group or List Membership -->
   <xs:complexType name="memberParamType">
     <xs:complexContent mixed="false">
-      <xs:extension base="xcal:cal-addressListParamType"/>
+      <xs:extension base="xcal:CalAddressListParamType">
+      </xs:extension>
     </xs:complexContent>
   </xs:complexType>
   
   <!-- 3.2.12 Participation Status -->
-  <xs:simpleType name="partstatParamType">
+  <xs:simpleType name="partstatValueType">
     <xs:union memberTypes="xcal:type-partstat-event xcal:type-partstat-todo xcal:type-partstat-jour"/>
   </xs:simpleType>
@@ -157,6 +277,16 @@
   </xs:simpleType>
   
+  <xs:complexType name="partstatParamType">
+    <xs:complexContent mixed="false">
+      <xs:extension base="xcal:BaseParameterType">
+        <xs:sequence>
+          <xs:element name="text" type="xcal:partstatValueType"/>
+        </xs:sequence>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+  
   <!-- 3.2.13 Recurrence Identifier Range -->
-  <xs:simpleType name="rangeParamType">
+  <xs:simpleType name="rangeValueType">
     <xs:restriction base="xs:token">
       <xs:enumeration value="THISANDFUTURE"/>
@@ -164,6 +294,16 @@
   </xs:simpleType>
   
+  <xs:complexType name="rangeParamType">
+    <xs:complexContent mixed="false">
+      <xs:extension base="xcal:BaseParameterType">
+        <xs:sequence>
+          <xs:element name="text" type="xcal:rangeValueType"/>
+        </xs:sequence>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+  
   <!-- 3.2.14 Alarm Trigger Relationship -->
-  <xs:simpleType name="relatedParamType">
+  <xs:simpleType name="relatedValueType">
     <xs:restriction base="xs:token">
       <xs:enumeration value="START"/>
@@ -172,6 +312,16 @@
   </xs:simpleType>
   
+  <xs:complexType name="relatedParamType">
+    <xs:complexContent mixed="false">
+      <xs:extension base="xcal:BaseParameterType">
+        <xs:sequence>
+          <xs:element name="text" type="xcal:relatedValueType"/>
+        </xs:sequence>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+  
   <!-- 3.2.15 Relationship Type -->
-  <xs:simpleType name="reltypeParamType">
+  <xs:simpleType name="reltypeValueType">
     <xs:restriction base="xs:token">
       <xs:enumeration value="PARENT"/>
@@ -181,6 +331,16 @@
   </xs:simpleType>
   
+  <xs:complexType name="reltypeParamType">
+    <xs:complexContent mixed="false">
+      <xs:extension base="xcal:BaseParameterType">
+        <xs:sequence>
+          <xs:element name="text" type="xcal:reltypeValueType"/>
+        </xs:sequence>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+  
   <!-- 3.2.16 Participation Role -->
-  <xs:simpleType name="roleParamType">
+  <xs:simpleType name="roleValueType">
     <xs:restriction base="xs:token">
       <xs:enumeration value="CHAIR"/>
@@ -191,6 +351,16 @@
   </xs:simpleType>
   
+  <xs:complexType name="roleParamType">
+    <xs:complexContent mixed="false">
+      <xs:extension base="xcal:BaseParameterType">
+        <xs:sequence>
+          <xs:element name="text" type="xcal:roleValueType"/>
+        </xs:sequence>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+  
   <!-- 3.2.17 RSVP Expectation -->
-  <xs:simpleType name="rsvpParamType">
+  <xs:simpleType name="rsvpValueType">
     <xs:restriction base="xs:token">
       <xs:enumeration value="TRUE"/>
@@ -199,14 +369,78 @@
   </xs:simpleType>
   
+  <xs:complexType name="rsvpParamType">
+    <xs:complexContent mixed="false">
+      <xs:extension base="xcal:BaseParameterType">
+        <xs:sequence>
+          <xs:element name="text" type="xcal:rsvpValueType"/>
+        </xs:sequence>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+  
   <!-- 3.2.18 Sent By -->
   <xs:complexType name="sent-byParamType">
-    <xs:sequence>
-      <xs:element ref="xcal:cal-address"/>
-    </xs:sequence>
+    <xs:complexContent mixed="false">
+      <xs:extension base="xcal:CalAddressParamType">
+      </xs:extension>
+    </xs:complexContent>
   </xs:complexType>
   
   <!-- 3.2.19 Time Zone Identifier -->
-  <xs:simpleType name="tzidParamType">
-    <xs:restriction base="xs:string"/>
-  </xs:simpleType>
+  <xs:complexType name="tzidParamType">
+    <xs:complexContent mixed="false">
+      <xs:extension base="xcal:TextParameterType"/>
+    </xs:complexContent>
+  </xs:complexType>
+  
+  <!-- Scheduling parameters - Defined by CalDAV scheduling -->
+  
+  <xs:simpleType name="schedule-agentValueType">
+    <xs:restriction base="xs:token">
+      <xs:enumeration value="SERVER"/>
+      <xs:enumeration value="CLIENT"/>
+      <xs:enumeration value="NONE"/>
+    </xs:restriction>
+  </xs:simpleType>
+  
+  <xs:complexType name="schedule-agentParamType">
+    <xs:complexContent mixed="false">
+      <xs:extension base="xcal:BaseParameterType">
+        <xs:sequence>
+          <xs:element name="text" type="xcal:schedule-agentValueType"/>
+        </xs:sequence>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+  
+  <xs:simpleType name="schedule-force-sendValueType">
+    <xs:restriction base="xs:token">
+      <xs:enumeration value="REQUEST"/>
+      <xs:enumeration value="REPLY"/>
+    </xs:restriction>
+  </xs:simpleType>
+  
+  <xs:complexType name="schedule-force-sendParamType">
+    <xs:complexContent mixed="false">
+      <xs:extension base="xcal:BaseParameterType">
+        <xs:sequence>
+          <xs:element name="text" type="xcal:schedule-force-sendValueType"/>
+        </xs:sequence>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+  
+  <xs:complexType name="schedule-statusParamType">
+    <xs:complexContent mixed="false">
+      <xs:extension base="xcal:TextParameterType"/>
+    </xs:complexContent>
+  </xs:complexType>
+  
+  <!-- Bedework x-parameters -->
+  
+  <xs:complexType name="x-bedework-uidParamType">
+    <xs:complexContent mixed="false">
+      <xs:extension base="xcal:TextParameterType"/>
+    </xs:complexContent>
+  </xs:complexType>
 </xs:schema>
Index: trunk/resources/exsynchwsdefs/iCalendar-props.xsd
===================================================================
--- trunk/resources/exsynchwsdefs/iCalendar-props.xsd (revision 3055)
+++ trunk/resources/exsynchwsdefs/iCalendar-props.xsd (revision 3103)
@@ -18,4 +18,21 @@
   <xs:include schemaLocation="iCalendar-ms-extensions.xsd" />
 
+  <!-- =====================================================================
+        BasePropertyType 
+        All properties are based off this type which defines a property as 
+        nothing more than a list of parameters. 
+        
+        We make no attempt to define valid parameters for each property as this
+        would complicate the schema significantly. Consumers can ignore 
+        property parameters they do not understand or expect. 
+       ===================================================================== -->  
+  <xs:complexType name="BasePropertyType" abstract="true" >
+    <xs:sequence>
+      <xs:element name="parameters" type="xcal:ArrayOfParameters"/>
+    </xs:sequence>
+  </xs:complexType>
+
+  <xs:element name="base-property" type="xcal:BasePropertyType" />
+
   <xs:complexType name="ArrayOfProperties">
     <xs:sequence>
@@ -24,6 +41,9 @@
   </xs:complexType>
   
-  <xs:element name="base-property" type="xcal:BasePropertyType" />
-  
+  <!-- =====================================================================
+       Define all the standard properties. By using a substitutionGroup we
+       make it easy to extend the list of properties. As an example see 
+       the properties defined in iCalendar-ms-extensions.xsd
+       ===================================================================== -->  
   <xs:element name="calscale" type="xcal:calscalePropType"
               substitutionGroup="xcal:base-property" />
@@ -72,6 +92,8 @@
   <xs:element name="transp" type="xcal:transpPropType"
               substitutionGroup="xcal:base-property" />
+  <!-- Comment out tzid for the moment. It has the same name as the parameter
+       and this is causing me some issues
   <xs:element name="tzid" type="xcal:tzidPropType"
-              substitutionGroup="xcal:base-property" />
+              substitutionGroup="xcal:base-property" /> -->
   <xs:element name="tzname" type="xcal:tznamePropType"
               substitutionGroup="xcal:base-property" />
@@ -116,14 +138,8 @@
   <xs:element name="last-modified" type="xcal:last-modifiedPropType"
               substitutionGroup="xcal:base-property" />
-  <xs:element name="sequence" type="xcal:request-statusPropType"
+  <xs:element name="sequence" type="xcal:sequencePropType"
               substitutionGroup="xcal:base-property" />
   <xs:element name="request-status" type="xcal:request-statusPropType"
               substitutionGroup="xcal:base-property" />
-
-  <xs:complexType name="BasePropertyType" abstract="true" >
-    <xs:sequence>
-      <xs:element name="parameters" type="xcal:ArrayOfParameters"/>
-    </xs:sequence>
-  </xs:complexType>
 
   <!-- Properties that take a simple text value -->
@@ -198,4 +214,15 @@
         <xs:sequence>
           <xs:element ref="xcal:date-time"/>
+        </xs:sequence>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+
+  <!-- Properties that take a utc-date-time value -->
+  <xs:complexType name="UtcDatetimePropertyType" >
+    <xs:complexContent mixed="false">
+      <xs:extension base="xcal:BasePropertyType">
+        <xs:sequence>
+          <xs:element ref="xcal:utc-date-time"/>
         </xs:sequence>
       </xs:extension>
@@ -406,5 +433,5 @@
   <xs:complexType name="completedPropType">
     <xs:complexContent mixed="false">
-      <xs:extension base="xcal:DateDatetimePropertyType"/>
+      <xs:extension base="xcal:UtcDatetimePropertyType"/>
     </xs:complexContent>
   </xs:complexType>
@@ -655,5 +682,5 @@
   <xs:complexType name="createdPropType">
     <xs:complexContent mixed="false">
-      <xs:extension base="xcal:DatetimePropertyType"/>
+      <xs:extension base="xcal:UtcDatetimePropertyType"/>
     </xs:complexContent>
   </xs:complexType>
@@ -662,5 +689,5 @@
   <xs:complexType name="dtstampPropType">
     <xs:complexContent mixed="false">
-      <xs:extension base="xcal:DatetimePropertyType"/>
+      <xs:extension base="xcal:UtcDatetimePropertyType"/>
     </xs:complexContent>
   </xs:complexType>
@@ -669,5 +696,5 @@
   <xs:complexType name="last-modifiedPropType">
     <xs:complexContent mixed="false">
-      <xs:extension base="xcal:DatetimePropertyType"/>
+      <xs:extension base="xcal:UtcDatetimePropertyType"/>
     </xs:complexContent>
   </xs:complexType>
Index: trunk/resources/exsynchwsdefs/iCalendar-valtypes.xsd
===================================================================
--- trunk/resources/exsynchwsdefs/iCalendar-valtypes.xsd (revision 3063)
+++ trunk/resources/exsynchwsdefs/iCalendar-valtypes.xsd (revision 3103)
@@ -36,4 +36,9 @@
 	<!-- 3.3.5 DATE-TIME -->
 	<xs:element name="date-time" type="xs:string"/>
+  
+  <!-- Patterns should allow us to restrict this 
+     e.g.     19980119T070000Z
+  -->
+  <xs:element name="utc-date-time" type="xs:string"/>
   
 	<!-- 3.3.6 DURATION