public Set<String> addContent(String variable,String value){
  if (!paused) {
    curState.addToState(new Assignment(variable,value));
    return update();
  }
 else {
    log.info("system is paused, ignoring " + variable + "="+ value);
    return Collections.emptySet();
  }
}

public Set < String > addContent ( String variable , String value ) { if ( ! paused ) { curState . addToState ( new Assignment ( variable , value ) ) ; return update ( ) ; } else { log . info ( "system is paused, ignoring " + variable + "=" + value ) ; return Collections . emptySet ( ) ; } }
adds the content ( expressed as a pair of variable = value ) to the current dialogue state , and subsequently updates the dialogue state .
