[docbook] writing xml-tags in docbook not interpreted by xslt-processor

["ro bert" <r1o2b3v4 at hotmail dot com>]

Hi,

i would like to write something like this in docbook, thus my tags are
interpreted as pure text:

<screen>

<my-tag>
 <my-tag2 attr="" attr2=""/>
</my-tag>

</screen>

But my xslt-processor complains and interprets
my-tags as invalid docbook tags.

Is there a docbook language tag, which prevents this or are there any 
parameters for my
xslt-processor.
My command is :

xsltproc  ../Stylesheets/docbook-xsl-1.64.0/html/docbook.xsl example.xml

thanks a lot, robert