docs: function Link(href, rel, type) {
    if (typeof href == 'object') {
      var options = href;
      this.href = options.href;
      this.template = options.template;
      this.rel = options.rel;
      this.type = options.type;
    } else {
      this.href = href;
      this.rel = rel;
      this.type = type;
    }
    
    this.titles = new MultiHash();
    this.properties = new MultiHash();
  }