Retrieval of features:
feature_get -i 1 -n encoding
response:
<response command="feature_get" transaction_id="1" feature_name="encoding" supported="1"> <![CDATA[UTF-8]]></response>
Setting features:
feature_set -i 2 -n show_hidden -v 1
response:
<reponse command="feature_set" transaction_id="2" feature="show_hidden" success="1"></response>
Features include:
language_name [RO], supports_async [RO],
max_children, max_data, max_depth [RO], show_hidden and
supports_postmortem [RO].