Help needed with xsl and xsltproc

Hi,

in my project which I try to transform from docbook 4 to 5 I have following xsl file.

    <?xml version='1.0'?>
    <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
    <xsl:import href="http://docbook.sourceforge.net/release/xsl/current/profiling/
profile.xsl"/>
    </xsl:stylesheet>


The file is used in the make file with following command.

    xsltproc --nonet --xinclude --output darktable_profile.xml xsl/darktable_profile.xsl 
darktable.xml &> error.out


The Command works with the docbook4 documents fine.

To use the xsl file for my docbook 5 I changed it as follow (derived by http://
www.sagehill.net/docbookxsl/CustomDb5Xsl.html):

/    <?xml version="1.0"?>/
/    <xsl:stylesheet /
/         xmlns:xsl="http://www.w3.org/1999/XSL/Transform"/
/         xmlns:fo="http://www.w3.org/1999/XSL/Format"/
/         xmlns:d="http://docbook.org/ns/docbook"/
/         exclude-result-prefixes="d"/
/         version="1.0">/
/   <xsl:import href="http://docbook.sourceforge.net/release/xsl/current/profiling/
profile.xsl"/>/
/    </xsl:stylesheet>/

When I run the command with the docbook 5 files, I get following error output like below:

/I/O error : Attempt to load network entity http://www.w3.org/2003/entities/iso8879/
isolat1.ent/
/    darktable.ent:5: warning: failed to load external entity "http://www.w3.org/2003/
entities/iso8879/isolat1.ent"/
/      %isolat1;/
/           ^/
/darktable.xml:32: parser error : Entity 'eacute' not defined/
/        Kazik, Eckhart Pedersen, Edouard Gomez, Fr&eacute;d&eacute;ric Grollier,/

I changed the import row to use the namespaced stylesheeds as follow:

/   <xsl:import href="http://docbook.sourceforge.net/release/xsl-ns/current/profiling/
profile.xsl"/>/

But now I get following error messages:

/I/O error : Attempt to load network entity http://docbook.sourceforge.net/release/xsl-ns/
current/profiling/profile.xsl/
/warning: failed to load external entity "http://docbook.sourceforge.net/release/xsl-ns/
current/profiling/profile.xsl"/
/compilation error: file xsl/darktable_profile.xsl line 10 element import/
/xsl:import : unable to load http://docbook.sourceforge.net/release/xsl-ns/current/
profiling/profile.xsl/

*What do I wrong?*
*Where is my error in thinking?*

_My files can be found here:_
https://github.com/mepi0011/darktable/tree/docBook5_port/doc/usermanual

Thanks
Pierre