actionscript 3: dynamically add attribute to xml element

pf is an XML object, cols is an array of attribute values, and headers is an array of attribute names.

The @[variable name] syntax works the magic.

for(var cn:int=0;cn<cols.length;cn++){
  var col_name:String = headers[cn];
  pf.ROW[rn-1].@[col_name]=cols[cn];
}