[docbook-apps] dbhtml-include and entities

[Tim Arnold]

hi, I'm using dbhtml-include processing instructions (in DocBook5) to include 
some external xhtml files.

Some of these files contain the non-breaking space entity,  
Files containing the entity do not get included in the final html.

Is there a way I can define the entity so the stylesheets can include them?  I 
put this at the top of my htmlhelp.xsl file:
<?xml version="1.0"?>
<!DOCTYPE stylesheet [
<!ENTITY nbsp " ">
]>
<xsl:stylesheet xmlns:xsl=http://www.w3.org/1999/XSL/Transform
etc etc.

thanks for any ideas,
--Tim