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<CONFIG_PARM NAME="default network packet size">
    <SETTING>512</SETTING>
...
         <RELATIONSHIP>LESS OR EQUAL</RELATIONSHIP>
    </LINK_CONFIG>
</CONFIG_PARM>

 
 $RELATIONSHIP = $elt->first_child('LINK_CONFIG')->text
    if ( defined($elt->first_child('LINK_CONFIG')) );

  Linked to Config 'max online engines'
    EQUAL BUT POWER OF 2