EX_XML_ID_REF_ENTITY_Trainning.DTD

<?xml version="1.0" encoding="UTF-8"?>

    <!ENTITY % repventas SYSTEM "./vendedores.txt">
    <!ENTITY % clientes SYSTEM "./clientes.txt">
    <!ENTITY % pedidos SYSTEM "./pedidos.txt">


<!ELEMENT trainning (repventas, clientes, pedidos)>

%repventas;
%clientes;
%pedidos;