anchor.diff:          <cctag>COMMON_CONFIG_TAG_DEFAULT</cctag>
           <protected>PROTECTED_SERVER_DEFAULT</protected>
           <reloadonchange>RELOAD_ON_CHANGE_DEFAULT</reloadonchange>
  +        <envs group="SV_ENV_GROUP_NAME">
  +            <env name="SV_ENV_VARIABLE_NAME">SV_ENV_VARIABLE_VALUE</env>
  +            <env name="SV_ENV_VARIABLE_NAME_UNSET" unset="y" />
  +            ...
  +            <env name="SV_ENV_VARIABLE_NAME_N">SV_ENV_VARIABLE_VALUE_N</env>
  +        </envs>
  +        ...
  +        <envs group="SV_ENV_GROUP_NAME_N">
  +            ...
  +        </envs>
       </defaults>
       <servers>
           <server name="SERVER_BINARY_NAME">
  
positive.code:         </server>
      </servers>
      <clients>
          <client cmdline="CLT_COMMAND_LINE [${NDRX_CLTTAG} ${NDRX_CLTSUBSECT}]" 
              log="CLT_LOG" 
              stdout="CLT_STDOUT"
  
negative.code:             wd="CLT_WD"
              klevel="CLT_KLEVEL"
              autostart="CLT_AUTOSTART">
  
              <envs>
                  <usegroup>CLT_ENV_GROUP_NAME</usegroup>
                  ...
                  <usegroup>CLT_ENV_GROUP_NAME_N</usegroup>
                  <env name="CLTPROC_ENV_VARIABLE_NAME">CLTPROC_ENV_VARIABLE_VALUE</env>
                  <env name="CLTPROC_ENV_VARIABLE_NAME_UNSET" unset="y" />
                  ...
                  <env name="CLPROC_ENV_VARIABLE_NAME_N">CLTPROC_ENV_VARIABLE_VALUE_N</env>
              </envs>
  
              <exec tag="CLT_TAG_EXEC" 
                  subsect="CLT_SUBSECT_EXEC" 
  