DOCBOOK-APPS: DTD and entities

[Vitaly Ostanin <vyt@vzljot.ru>]

Hello!

1.
DTD for DocBook/XML have PUBLIC "-//OASIS//DTD DocBook XML 
V4.1.2//EN". Please, tell me, for what "//EN" at end of string ?

It's language declaration? Where I can to read about it ?

2.
I want to declare entities in separate file.
Can I describe "encoding" in file with entities like

<?xml version="1.0" encoding="cp1251"?>
<!ENTITY ... >
<!ENTITY ... >
?

If yes, then file with entities is not well-formed XML ?

Thanks.

-- 
Regards, Vyt
mailto:  vyt@vzljot.ru
JID:     vyt@vzljot.ru