[xsl] "Illegal character in authority" error running java Saxon under Windows

["Sam Wilmott" <sam@xxxxxxxxxx>]

I'm using the Java version of Saxon-B 8.9 and Saxon-B 9.0.02 
on both Mac OS X 10.5 and Windows XP Pro for processing XML 
documents using XSLT 2.0.  I'm running Saxon in command-line 
form in both cases (CMD in Windows and Terminal in Mac OS).

I'm having a problem with an input XML document whose DTD 
contains an NDATA entity declared like this:

<!ENTITY xxxxx PUBLIC "-//xxxxxx//XXXX xxxxxx//EN"
"//xx-xxx-xxxxxx 
x/xxxxx/xxx/xxx/xxxxxx/xxxxxxx/xxxx/xxxxx/xxxxxx/xxxxxxxxxxxx.jpg"
NDATA XXXX>

whose name is used as the value of an attribute that's 
declared like this:

entname ENTITY #REQUIRED

e.g. it's used like this:

<xxx entname="xxxxx"/>

The XSLT 2.0 script runs just fine under Mac OS, but under 
Windows the program terminates with an error message like 
this (I've stripped out a long list of nested method names, 
but that's all):

java.lang.IllegalArgumentException
at ...
Caused by: java.net.URISyntaxException: Illegal character in 
authority at index 2: //xx-xxx-xxxxxx 
x/xxxxx/xxx/xxx/xxxxxx/xxxxxxx/xxxx/xxxxx/xxxxxx/xxxxxxxxxxxx.jpg
at ...
Fatal error during transformation: 
java.lang.IllegalArgumentException:  (no message)


Note that there's a space in the SYSTEM name of the entity. 
If I remove it, the XSLT script runs just fine.  So it looks 
like the space is the "Illegal character".

Does anyone know what's going on here?  Most importantly, I 
would like to process documents with entity declarations 
like the above without having to change the source XML 
documents by removing spaces in entity SYSTEM names.  Is 
there a way of doing that?

------------
Sam Wilmott
sam@xxxxxxxxxx
www.wilmott.ca