lang=pt-BR, UTF-8 and caracters in portuguese

Dear friends,

I'm learning how to use docbook with debian 4.0.

I installed docbook with apt-get tools and convert xml source files with the script jw

In prologue I use 
<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook V3.1//EN">

To use portuguese I include the attribute lang="pt-BR" in article tag:

<article lang="pt-BR">

But the html file generate caracter like this:

Automação de Métodos Analíticos

When I change codification in browser to utf-8 I can see:

Automação de Métodos Analíticos

But it changes also the caracters included by the docbook
 tool:

Hist�rico de Revis�es
Revis�o 1

And I would like this:

Histórico de Revisões
Revisão 1

But when I remove lang="pt-BR" I have:

Revision History
Revision 1

How can I solve this?

Thanks in advance
Jose

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