Have seen senML before but not that specific IETF version just reading it now and it's seem to have the same ideas in them.
<message from='
device@example.org'
to='
client@example.org/amr'>
<fields xmlns='urn:xmpp:iot:sensordata' seqnr='1' done='true'>
<node nodeId='Device01'>
<timestamp value='2013-03-07T16:24:30'>
<numeric name='Temperature' momentary='true' automaticReadout='true' value='23.4' unit='°C'/>
</timestamp>
<timestamp value='2013-03-07T16:24:31'>
<numeric name='Temperature' momentary='true' automaticReadout='true' value='23.4' unit='°C'/>
</timestamp>
</node>
</fields>
</message>
SenMl
[
{"n":"urn:dev:ow:10e2073a01080063","u":"Cel","t":1.276020076e+09,
"v":23.5},
{"n":"urn:dev:ow:10e2073a01080063","u":"Cel","t":1.276020091e+09,
"v":23.6}
]