Including SVG into another SVG doesn't work

Otto Wyss <[email protected]> Thu, 15 Sep 2011 08:25:24 +0200
Newsgroups gmane.comp.mozilla.devel.svg
Message-ID <[email protected]>
If an SVG is sourced in into another SVG, it's not shown and neither printed. 
See http://www.orpatec.ch/xtras/18xx/Test/SymIncludeTest.svg

Firefox shows the SVG but it's not printed through PDFCreator printer.