<server-groups>
    <server-group name="main-server-group" profile="full">
        <jvm name="default">
            <heap size="64m" max-size="512m"/>
                    <jvm-options>
                        <option value="-agentpath:"<DT_HOME>/agent/lib/libdtagent.so"=name=<AgentName>,server=<dynaTraceCollectorName>"/>
                    </jvm-options>
            </jvm>
            <socket-binding-group ref="full-sockets"/>
        </server-group>
    </server-groups>
</domain>

<newtag newattr="attrval">tagval</newtag>

$ xmlstarlet ed -d '//server-group/newtag' file.xml

$ xmlstarlet ed -s '//server-group'        -t elem -n 'newtag'  -v 'tagval'
                -s '//server-group/newtag' -t attr -n 'newattr' -v 'attrval' file.xml

$ xmlstarlet ed -d '//server-group/newtag'
                -s '//server-group'        -t elem -n 'newtag'  -v 'tagval'
                -s '//server-group/newtag' -t attr -n 'newattr' -v 'attrval' file.xml

<?xml version="1.0"?>
<server-groups>
  <server-group name="main-server-group" profile="full">
    <jvm name="default">
      <heap size="64m" max-size="512m"/>
      <jvm-options>
        <option value="somevalue"/>
      </jvm-options>
    </jvm>
    <socket-binding-group ref="full-sockets"/>
  </server-group>
</server-groups>

<?xml version="1.0"?>
<server-groups>
  <server-group name="main-server-group" profile="full">
    <jvm name="default">
      <heap size="64m" max-size="512m"/>
      <jvm-options>
        <option value="somevalue"/>
      </jvm-options>
    </jvm>
    <socket-binding-group ref="full-sockets"/>
    <newtag newattr="attrval">tagval</newtag>
  </server-group>
</server-groups>

<?xml version="1.0" encoding="UTF-8"?>
<workspaceFilter version="1.0">
    <filter root="/home/users">

<?xml version="1.0" encoding="UTF-8"?>
<workspaceFilter version="1.0">
    <filter root="/home/users" mode="merge">