// load ruby variables
int nrVars = rep.countNrStepAttributes(id_step, "ruby_variable_name");
rubyVariables.clear();
for(int i=0;i<nrVars;i++){
RubyVariableMeta var = new RubyVariableMeta(
rep.getStepAttributeString(id_step, i, "ruby_variable_name"),
rep.getStepAttributeString(id_step, i, "ruby_variable_value")
);
rubyVariables.add(var);
}