<?xml version="1.0"?>
<!--
  Convert
    <loc ...><port ...><port ...></loc>
  to
    <loc ...>BLOCK.PORT BLOCK.PORT</loc>
  -->
<xml>
 <pb_type name="parent">
  <input name="i" width="2" />
  <loc>
   <port name="o" />
   <port name="i" bit="0" />
   <port name="i" bit="1" />
  </loc>
 </pb_type>
</xml>