code: public AbstractPrintQuery addAttribute(final CIAttribute... _attributes)
          throws EFapsException
      {
          if (isMarked4execute()) {
              for (final CIAttribute attr : _attributes) {
                  addAttribute(attr.name);
              }
          }
          return this;
      }
docs: Add an attribute to the PrintQuery. It is used to get editable values
  from the eFaps DataBase.
  
  @param _attributes Attribute to add
  @return this PrintQuery
  @throws EFapsException on error