static L<WebNode> web_allForwardRelated(Web web, WebNode node, S relationLabel) {
  ret web_allForwardRelated(web, node, web.parseLabel(relationLabel));
}

static L<WebNode> web_allForwardRelated(Web web, WebNode node, Lisp relationLabel) {
  new L<WebNode> l;
  for (Pair<WebNode> p : keys(web.relations))
    if (p.a == node) {
      WebNode rel = web.relations.get(p);
      if (rel.hasLabel(relationLabel))
        l.add(p.b);
    }
  ret l;
}

static L<WebNode> web_allForwardRelated(WebNode node) {
  ret pairList_forwardLookup(keys(node.web.relations), node);
}