code: function SelectorSubPart(text, type, line, col) {
  
      SyntaxUnit.call(this, text, line, col, Parser.SELECTOR_SUB_PART_TYPE);
  
      /**
       * The type of modifier.
       * @type String
       * @property type
       */
      this.type = type;
  
      /**
       * Some subparts have arguments, this represents them.
       * @type Array
       * @property args
       */
      this.args = [];
  
  }
docs: Represents a selector modifier string, meaning a class name, element name,
  element ID, pseudo rule, etc.
  @namespace parserlib.css
  @class SelectorSubPart
  @extends parserlib.util.SyntaxUnit
  @constructor
  @param {String} text The text representation of the unit.
  @param {String} type The type of selector modifier.
  @param {int} line The line of text on which the unit resides.
  @param {int} col The column of text on which the unit resides.