I'm trying to build a pattern that select the second descendant of the type"articulo" of the document:
 <doc>
 <titulo>My title</titulo>
 <capitulo>My capitulo I</captiulo>
     <seccion>My seccion</seccion>
         <articulo><head>articulo 1</head>
             <p>My p</p>
         </articulo>
         <artiuculo><head>articulo 2</head>
             <p>.....</p>
         </articulo>
    </seccion>
 </capitulo>

 I think that the pattern "//articulo[2]" is the correct but the XSLT
 proccesor doesn´t found it.
 ¿what is the correct pattern to select the second element of the type
 "articulo"?
 Thanks.