code: public Value createValue(Identifier value)
     {
        if (value == null)
           return null;
        try
        {
           return new ReferenceValue(value);
        }
        catch (IOException e)
        {
           LOG.warn("Cannot create REFERENCE Value from Identifier " + value, e);
           return null;
        }
     }
docs: Create Value from Id.
  
  @param value
  Identifier
  @return Value Reference