anchor.diff:                              <contextValue>20</contextValue>
                               <metadata>
                                   <contextMetadata>
  -                                    <name>attributeValueIdentifier</name>
  +                                    <name>ID</name>
                                       <type>long</type>
                                       <value>1</value>
                                   </contextMetadata>
  
positive.code:             <subscribeError>
                  <subscriptionId></subscriptionId>
                      <errorCode>
                          <code>400</code>
                          <reasonPhrase>Subscription Error</reasonPhrase>
                          <details>Internal Error</details>
                      </errorCode>
  
negative.code:                     <attribute>temperature</attribute>
                  </attributeList>
              <reference>127.0.0.1</reference>
              <duration>P5M</duration>
              <restriction>
                  <attributeExpression>someXPATH</attributeExpression>
                  <scope>
                      <operationScope>
                          <scopeType>someScopeType</scopeType>
                          <scopeValue>someScopeValue</scopeValue>
                      </operationScope>
                  </scope>
              </restriction>
  