code: protected org.apache.log4j.helpers.PatternParser createPatternParser(final String pattern) {
  		return new FoundationLoggingPatternParser(pattern);
  	}
docs: Returns PatternParser used to parse the conversion string. Subclasses may
  override this to return a subclass of PatternParser which recognize
  custom conversion characters.
  
  @since 0.9.0