\replacefeature [f:mine] \feature [new][f:mine] \feature[=][f:mine]
\resetandaddfeature[f:mine] \feature[local][f:mine] \feature[!][f:mine]
\revivefeature [f:mine] \feature [old][f:mine] \feature[>][f:mine]
\resetfeature \feature[reset] \feature[<]
</texcode>