docs: function () {
        if (this.complexity == null) {
          var complexity = 0;
          if (this.isToken) {
            complexity = COMPLEXITY.TEXT * this.data.join("").length + COMPLEXITY.TOKEN;
          } else {
            for (var i = 0, m = this.data.length; i < m; i++) {
              if (this.data[i]) {
                this.SetData(i,this.data[i].Collapse());
                complexity += this.data[i].complexity;
              }
            }
            if (m > 1) complexity += m * COMPLEXITY.CHILD;
          }
          if (this.attrNames && !("complexity" in this)) this.attrNames.push(COMPLEXATTR);
          if (this.attr) this.attr[COMPLEXATTR] = complexity;
          this.complexity = complexity;
        }
        return this.complexity;
      }