variable_type = get_type(cdef,category_id,variable_id)
current_value = get_current_value(cread,cwrite,category_id, variable_id)
varname = get_varname (cread,category_id, variable_id)
variable_type = get_type(cdef,category_id,variable_id)
current_value = get_current_value(cread,cwrite,category_id, variable_id)
varname = get_varname (cread,category_id, variable_id)