...
- <entities> a list of entities (it is valid to use ranges as a:b ,can use "all" to select everything, "end" to specify the last entity, layer:<layername> to select the entities in this layer) ; if <over> is face_elements then you must specify a list of "entitynumface" instead just "entity".
- wherefield <fieldname> <fieldvalue> To unassign this condition olny only for the entities where the field named 'fieldname' has the value 'fieldvalue'
...