/**
  * If the property value must be one of a set of known tagged values, then this method should
  * return an array of the tags. This can be used to represent (for example) enum values. If a
  * PropertyEditor supports tags, then it should support the use of setAsText with a tag value as a
  * way of setting the value and the use of getAsText to identify the current value.
  *
  * @return The tag values for this property. May be null if this property cannot be represented as
  *     a tagged value.
  */
 public String[] getTags() {
   return new String[] {
     BoxSizing.BORDER_BOX.toString(), BoxSizing.CONTENT_BOX.toString(),
   };
 }