code: function PropertyValue(parts, line, col){
  
      SyntaxUnit.call(this, parts.join(" "), line, col);
      
      /**
       * The parts that make up the selector.
       * @type Array
       * @property parts
       */
      this.parts = parts;
      
  }
docs: Represents a single part of a CSS property value, meaning that it represents
  just everything single part between ":" and ";". If there are multiple values
  separated by commas, this type represents just one of the values.
  @param {String[]} parts An array of value parts making up this value.
  @param {int} line The line of text on which the unit resides.
  @param {int} col The column of text on which the unit resides.
  @namespace parserlib.css
  @class PropertyValue
  @extends parserlib.util.SyntaxUnit
  @constructor