code: protected void writeAttribute( String name, String value)
      {
      print( " ");
      print( name);
      print( "=\"");
      // StringEscapeUtils escapes symbols ', < >, &, ", and some control characters
      // NumericEntityEscaper translates additional control characters \n, \t, ...
      print( NumericEntityEscaper.below(0x20).translate(StringEscapeUtils.escapeXml11(value)));
      print( "\"");
      }
docs: Writes an attribute definition.