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JackJ:
Thanks for your nice comments. In fact, in order to use the module stylesheet as intended, all a user needs is that the active theme has, as XOOPS' own default theme does, a line stating:
<{$xoops_module_header}>
As you can see in the code, in all files I'm using, just before closing them, this declaration:
$xoopsTpl->assign("xoops_module_header", '');
What this does is assign to the variable <{$xoops_module_header}> the HTML link to the module's own CSS file.
Cheers.