yakamara/redaxo_xform — pull request #264 by jdlx (2014-10-19 11:51:17+00:00)
Title: [select] enable optgroups ..

.. per `OPTGROUP=Obst,Apfel=a,OPTGROUP=Gemüse,Salat=s`
bzw.
`array('Obst' => 'OPTGROUP', 'a' => 'Apfel', 'Gemüse' => 'OPTGROUP', 's' => 'Salat')`