yes, you are right, because the variables for the following xml part it suppose to be not available for current request, which corresponds to operation == 'get_leafs'...
<total>1.0</total>
<records>2</records>
<row id = '2'>
<cell>2</cell>
<cell>ns1:max-lease-time</cell>
<cell>asds</cell>
</row>
<row id = '3'>
<cell>3</cell>
<cell>ns1:default-lease-time</cell>
<cell>600</cell>
</row>
</rows>
