legacy/src/main/java/thredds/catalog/query/QueryCapability.java
public void appendErrorMessage( String message, boolean fatal) {
    errLog.append( message);
    errLog.append( "\n");
    fatalError = fatalError || fatal;
  }
public void appendErrorMessage( String message, boolean fatal) {
    errLog.append( message);
    errLog.append( "\n");
    fatalError = fatalError || fatal;
  }
Append an error message to the message log. Call check() to get the log when
everything is done.
@param message append this message to log
@param fatal true if this is a fatal error.