code: private void init (String publicId, String systemId,
                 int lineNumber, int columnNumber)
      {
      this.publicId = publicId;
      this.systemId = systemId;
      this.lineNumber = lineNumber;
      this.columnNumber = columnNumber;
      }
docs: Internal initialization method.
  
  @param publicId The public identifier of the entity which generated the exception,
  or null.
  @param systemId The system identifier of the entity which generated the exception,
  or null.
  @param lineNumber The line number of the error, or -1.
  @param columnNumber The column number of the error, or -1.