docs: protected void _format(SarlEvent event, IFormattableDocument document) {
  		formatAnnotations(event, document, XbaseFormatterPreferenceKeys.newLineAfterClassAnnotations);
  		formatModifiers(event, document);
  
  		final ISemanticRegionsFinder regionFor = this.textRegionExtensions.regionFor(event);
  		document.append(regionFor.keyword(this.keywords.getEventKeyword()), ONE_SPACE);
  
  		document.surround(regionFor.keyword(this.keywords.getExtendsKeyword()), ONE_SPACE);
  		document.format(event.getExtends());
  
  		formatBody(event, document);
  	}