//----------------------------------------------------------
// Zflow StringBuilder
Zflow.StringBuilder = function() { 
   this.buffer = []; 
 } 

Zflow.StringBuilder.prototype.append = function append(string) { 
   this.buffer.push(string); 
   return this; 
 }; 

Zflow.StringBuilder.prototype.toString = function toString() { 
   return this.buffer.join(""); 
 };