docs: function (mml) {
        if (mml.complexity > this.COLLAPSE.bigop || mml.data[0].type !== "mo") {
          var id = this.SplitAttribute(mml,"content").pop();
          var op = Collapsible.FindChildText(mml,id);
          mml = this.MakeAction(this.Marker(op),mml);
        }
        return mml;
      }