diff --git a/xml/api/crm_mon-2.26.rng b/xml/api/crm_mon-2.26.rng
index 1e501dd07b..ac6410cc5e 100644
--- a/xml/api/crm_mon-2.26.rng
+++ b/xml/api/crm_mon-2.26.rng
@@ -1,189 +1,210 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <grammar xmlns="http://relaxng.org/ns/structure/1.0"
          datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">
 
     <start>
         <ref name="element-crm-mon"/>
     </start>
 
     <define name="element-crm-mon">
-        <optional>
-            <externalRef href="pacemakerd-health-2.25.rng" />
-        </optional>
-        <optional>
-            <ref name="element-summary" />
-        </optional>
-        <optional>
-            <ref name="nodes-list" />
-        </optional>
-        <optional>
-            <ref name="resources-list" />
-        </optional>
-        <optional>
-            <ref name="node-attributes-list" />
-        </optional>
-        <optional>
-            <externalRef href="node-history-2.12.rng"/>
-        </optional>
-        <optional>
-            <ref name="failures-list" />
-        </optional>
-        <optional>
-            <ref name="fence-event-list" />
-        </optional>
-        <optional>
-            <ref name="tickets-list" />
-        </optional>
-        <optional>
-            <ref name="bans-list" />
-        </optional>
+        <choice>
+            <ref name="element-crm-mon-disconnected" />
+            <group>
+                <optional>
+                    <externalRef href="pacemakerd-health-2.25.rng" />
+                </optional>
+                <optional>
+                    <ref name="element-summary" />
+                </optional>
+                <optional>
+                    <ref name="nodes-list" />
+                </optional>
+                <optional>
+                    <ref name="resources-list" />
+                </optional>
+                <optional>
+                    <ref name="node-attributes-list" />
+                </optional>
+                <optional>
+                    <externalRef href="node-history-2.12.rng"/>
+                </optional>
+                <optional>
+                    <ref name="failures-list" />
+                </optional>
+                <optional>
+                    <ref name="fence-event-list" />
+                </optional>
+                <optional>
+                    <ref name="tickets-list" />
+                </optional>
+                <optional>
+                    <ref name="bans-list" />
+                </optional>
+            </group>
+        </choice>
+    </define>
+
+    <define name="element-crm-mon-disconnected">
+        <element name="crm-mon-disconnected">
+            <optional>
+                <attribute name="description"> <text /> </attribute>
+            </optional>
+            <optional>
+                <attribute name="pacemakerd-state"> <text /> </attribute>
+            </optional>
+        </element>
     </define>
 
     <define name="element-summary">
         <element name="summary">
             <optional>
                 <element name="stack">
                     <attribute name="type"> <text /> </attribute>
+                    <optional>
+                        <attribute name="pacemakerd-state">
+                            <text />
+                        </attribute>
+                    </optional>
                 </element>
             </optional>
             <optional>
                 <element name="current_dc">
                     <attribute name="present"> <data type="boolean" /> </attribute>
                     <optional>
                         <group>
                             <attribute name="version"> <text /> </attribute>
                             <attribute name="name"> <text /> </attribute>
                             <attribute name="id"> <text /> </attribute>
                             <attribute name="with_quorum"> <data type="boolean" /> </attribute>
                         </group>
                     </optional>
                     <optional>
                         <attribute name="mixed_version"> <data type="boolean" /> </attribute>
                     </optional>
                 </element>
             </optional>
             <optional>
                 <element name="last_update">
                     <attribute name="time"> <text /> </attribute>
                 </element>
                 <element name="last_change">
                     <attribute name="time"> <text /> </attribute>
                     <attribute name="user"> <text /> </attribute>
                     <attribute name="client"> <text /> </attribute>
                     <attribute name="origin"> <text /> </attribute>
                 </element>
             </optional>
             <optional>
                 <element name="nodes_configured">
                     <attribute name="number"> <data type="nonNegativeInteger" /> </attribute>
                 </element>
                 <element name="resources_configured">
                     <attribute name="number"> <data type="nonNegativeInteger" /> </attribute>
                     <attribute name="disabled"> <data type="nonNegativeInteger" /> </attribute>
                     <attribute name="blocked"> <data type="nonNegativeInteger" /> </attribute>
                 </element>
             </optional>
             <optional>
                 <element name="cluster_options">
                     <attribute name="stonith-enabled"> <data type="boolean" /> </attribute>
                     <attribute name="symmetric-cluster"> <data type="boolean" /> </attribute>
                     <attribute name="no-quorum-policy"> <text /> </attribute>
                     <attribute name="maintenance-mode"> <data type="boolean" /> </attribute>
                     <attribute name="stop-all-resources"> <data type="boolean" /> </attribute>
                     <attribute name="stonith-timeout-ms"> <data type="integer" /> </attribute>
                     <attribute name="priority-fencing-delay-ms"> <data type="integer" /> </attribute>
                 </element>
             </optional>
         </element>
     </define>
 
     <define name="resources-list">
         <element name="resources">
             <zeroOrMore>
                 <externalRef href="resources-2.24.rng" />
             </zeroOrMore>
         </element>
     </define>
 
     <define name="nodes-list">
         <element name="nodes">
             <zeroOrMore>
                 <externalRef href="nodes-2.24.rng" />
             </zeroOrMore>
         </element>
     </define>
 
     <define name="node-attributes-list">
         <element name="node_attributes">
             <zeroOrMore>
                 <externalRef href="node-attrs-2.8.rng" />
             </zeroOrMore>
         </element>
     </define>
 
     <define name="failures-list">
         <element name="failures">
             <zeroOrMore>
                 <externalRef href="failure-2.8.rng" />
             </zeroOrMore>
         </element>
     </define>
 
     <define name="fence-event-list">
         <element name="fence_history">
             <optional>
                 <attribute name="status"> <data type="integer" /> </attribute>
             </optional>
             <zeroOrMore>
                 <externalRef href="fence-event-2.15.rng" />
             </zeroOrMore>
         </element>
     </define>
 
     <define name="tickets-list">
         <element name="tickets">
             <zeroOrMore>
                 <ref name="element-ticket" />
             </zeroOrMore>
         </element>
     </define>
 
     <define name="bans-list">
         <element name="bans">
             <zeroOrMore>
                 <ref name="element-ban" />
             </zeroOrMore>
         </element>
     </define>
 
     <define name="element-ticket">
         <element name="ticket">
             <attribute name="id"> <text /> </attribute>
             <attribute name="status">
                 <choice>
                     <value>granted</value>
                     <value>revoked</value>
                 </choice>
             </attribute>
             <attribute name="standby"> <data type="boolean" /> </attribute>
             <optional>
                 <attribute name="last-granted"> <text /> </attribute>
             </optional>
         </element>
     </define>
 
     <define name="element-ban">
         <element name="ban">
             <attribute name="id"> <text /> </attribute>
             <attribute name="resource"> <text /> </attribute>
             <attribute name="node"> <text /> </attribute>
             <attribute name="weight"> <data type="integer" /> </attribute>
             <attribute name="promoted-only"> <data type="boolean" /> </attribute>
             <!-- DEPRECATED: master_only is a duplicate of promoted-only that is
                  provided solely for API backward compatibility. It will be
                  removed in a future release. Check promoted-only instead.
               -->
             <attribute name="master_only"> <data type="boolean" /> </attribute>
         </element>
     </define>
 </grammar>