public Attr(String name,byte[] value){
  _name=name.toLowerCase();
  _byteValues=new ArrayList<>(1);
  _byteValues.add(value);
}

public Attr ( String name , byte [ ] value ) { _name = name . toLowerCase ( ) ; _byteValues = new ArrayList < > ( 1 ) ; _byteValues . add ( value ) ; }
constructs an attribute value pair with byte array .
