diff --git a/schema/lib/elements/he_ipv6.xsd b/schema/lib/elements/he_ipv6.xsd
index b7bb149..a443d3c 100644
--- a/schema/lib/elements/he_ipv6.xsd
+++ b/schema/lib/elements/he_ipv6.xsd
@@ -18,7 +18,17 @@
   <xs:complexType name="e_he_ipv6_tunnel">
     <xs:all>
       <xs:element name="server" type="t_net_addr_ip4"/>
-      <xs:element name="allocs">
+      <xs:element name="client" minOccurs="1" maxOccurs="1">
+        <xs:complexType>
+          <xs:simpleContent>
+            <xs:extension base="t_net_addr_ip6">
+              <!-- VERY most likely "64" but we can't define a default with required. -->
+              <xs:attribute name="prefix" type="t_he_ipv6_prefix" use="required"/>
+            </xs:extension>
+          </xs:simpleContent>
+        </xs:complexType>
+      </xs:element>
+      <xs:element name="allocations">
         <xs:complexType>
           <xs:sequence minOccurs="1">
             <!-- HE only allocates a single /64 and, upon request, a single /48 per tunnel. -->
@@ -28,7 +38,7 @@
                   <xs:extension base="t_net_addr_ip6">
                     <!-- VERY most likely "64" but we can't define a default with required. -->
                     <xs:attribute name="prefix" type="t_he_ipv6_prefix" use="required"/>
-                    <xs:attribute name="iface" type="t_linux_iface_name" use="required"/>
+                    <xs:attribute name="id" type="xs:token" use="required"/>
                   </xs:extension>
                 </xs:simpleContent>
               </xs:complexType>
@@ -43,15 +53,25 @@
           <xs:selector xpath=".//*"/>
           <xs:field xpath="@prefix"/>
         </xs:unique>
+        <xs:unique name="uniq_alloc_id">
+          <xs:selector xpath=".//*"/>
+          <xs:field xpath="@id"/>
+        </xs:unique>
       </xs:element>
-      <xs:element name="client" minOccurs="1" maxOccurs="1">
+      <xs:element name="assignments" minOccurs="1" maxOccurs="1">
         <xs:complexType>
-          <xs:simpleContent>
-            <xs:extension base="t_net_addr_ip6">
-              <!-- VERY most likely "64" but we can't define a default with required. -->
-              <xs:attribute name="prefix" type="t_he_ipv6_prefix" use="required"/>
-            </xs:extension>
-          </xs:simpleContent>
+          <xs:sequence minOccurs="1" maxOccurs="unbounded">
+            <xs:element name="assign" minOccurs="1" maxOccurs="unbounded">
+              <xs:complexType>
+                <xs:attribute name="prefix" type="t_he_ipv6_prefix" use="optional" default="64"/>
+                <!-- TODO: alloc must be a defined alloc "id" attribute value. -->
+                <xs:attribute name="alloc" type="xs:token" use="required"/>
+                <xs:attribute name="iface" type="t_linux_iface_name" use="required"/>
+              </xs:complexType>
+            </xs:element>
+          </xs:sequence>
+          <xs:attribute name="radvd" type="xs:boolean" use="optional" default="false"/>
+          <xs:attribute name="radvdDns" type="xs:boolean" use="optional" default="false"/>
         </xs:complexType>
       </xs:element>
     </xs:all>