code: public Method createFunction(String ns, String name)
      {
          for (int i = 0; i < this.libraries.length; i++)
          {
              if (this.libraries[i].containsFunction(ns, name))
              {
                  return this.libraries[i].createFunction(ns, name);
              }
          }
          return null;
      }
docs: /*
  (non-Javadoc)
  
  @see org.apache.myfaces.view.facelets.tag.TagLibrary#createFunction(java.lang.String, java.lang.String)