<?xml version="1.0" standalone="no"?><!DOCTYPE person SYSTEM "http://www.cafeconleche.org/dtds/person.dtd"><person>  <name>    <first_name>Alan</first_name>    <last_name>Turing</last_name>  </name>  <profession>computer scientist</profession>  <profession>mathematician</profession>  <profession>cryptographer</profession></person>