code: public static String extractAsEnumerationValue(ModelProperty property, ModelAnnotation annotationClass, AnnotationAttributeType attribute) {
  		final Elements elementUtils=BaseProcessor.elementUtils;
  		final One<String> result = new One<String>();
  
  		extractAttributeValue(elementUtils, property.getElement(), annotationClass.getName(), attribute, new OnAttributeFoundListener() {
  
  			@Override
  			public void onFound(String value) {
  
  				result.value0 = value.substring(value.lastIndexOf(".") + 1);
  			}
  		});
  
  		return result.value0;
  	}
docs: Estract from an annotation of a property the attribute value specified.
  
  @param property            property to analyze
  @param annotationClass            annotation to analyze
  @param attribute the attribute
  @return attribute value as list of string