SQL & PL/SQL

I just wrote a FUNCTION to return XML from a web service. As the text can go over 32,767 characters, i figured a CLOB was the way to go:

 FUNCTION Get_XML(I_URL VARCHAR2)
 RETURN XMLTYPE
 AS

  Page		CLOB;
  Response	UTL_HTTP.HTML_PIECES;

 BEGIN 

  Response := UTL_HTTP.REQUEST_PIECES(I_URL);

  -- UTL_HTTP.REQUEST_PIECES returns 2000 byte chunks.
  FOR Chunk IN 1..Response.Count
  LOOP
   Page := Page || Response(Chunk);
  END LOOP;

  RETURN XMLTYPE(Page);

 END Get_XML;

My question is, is about the best way to concatenate the pieces. Is

Page := Page || Piece(Counter);

good, or should i be using DBMS_LOB.APPEND or similar?