code: function(keywords) {
           var node = this.createElementDefaultNS("KeywordList");
  
           for (var i=0, len=keywords.length; i<len; i++) {
               node.appendChild(this.createElementDefaultNS(
                   "Keyword", keywords[i]
               ));
           }
           return node;
       }
docs: Method: write_wmc_KeywordList