MIME Type for XSL

Hi!

1) Does anyone know, what is default MIME Type for "external" XSL ?
I need to configure my WEB-Server to proper MIME Type.

text/xsl
or
text/xml


2) What MIME Type I should use in my XML for "embedded" XSL ?
=========
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
     "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<?xml-stylesheet type="text/xsl"

href="http://docbook.sourceforge.net/release/xsl/current/html/docbook.xsl"?>
<article>
...
========

 Is there any standart for this ?


P.S. It defined for CSS, not for XSL : http://www.w3.org/TR/xml-stylesheet/

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