code: private void allRelation(Options opt, RelationType rt, ClassDoc from) {
  	String tagname = rt.lower;
  	for (Tag tag : from.tags(tagname)) {
  	    String t[] = tokenize(tag.text());    // l-src label l-dst target
  	    t = t.length == 1 ? new String[] { "-", "-", "-", t[0] } : t; // Shorthand
  	    if (t.length != 4) {
  		System.err.println("Error in " + from + "\n" + tagname + " expects four fields (l-src label l-dst target): " + tag.text());
  		return;
  	    }
  	    ClassDoc to = from.findClass(t[3]);
  	    if (to != null) {
  		if(hidden(to))
  		    continue;
  		relation(opt, rt, from, to, t[0], t[1], t[2]);
  	    } else {
  		if(hidden(t[3]))
  		    continue;
  		relation(opt, rt, from, from.toString(), to, t[3], t[0], t[1], t[2]);
  	    }
  	}
      }
docs: Print all relations for a given's class's tag
  @param tagname the tag containing the given relation
  @param from the source class
  @param edgetype the dot edge specification