code: private boolean notAllowedEnd(String endTag) {
  		errorState = errorState && endElements.containsKey(endTag)
  				&& forbiddenIdEndElements.containsKey(endTag);
  
  		return errorState;
  	}
docs: If error with wrong id tag occurs, the errorState flag will be set. In
  this case some end tags have to be ignored.
  
  @param endTag
  @return {@code true} if {@code endTag} is not allowed and will be ignored
  @see #setupForbiddenEndElements()