Comment 20 for bug 1046068

> how did this data get into the clipboard in the first place?

As described on comment #14: drag&drop of symbols from the 'Object > Symbols' dialog is done via clipboard internally.

See also:
<http://wiki.inkscape.org/wiki/index.php/SymbolsDialog>
<https://bugs.launchpad.net/inkscape/+bug/1079971>
<http://bazaar.launchpad.net/~inkscape.dev/inkscape/trunk/revision/11880>

To me it is a legitimate request that output extensions deal with inkscape clipboard content without failure - whether or not the clipboard data for a <symbol> element actually would need to (or never should) have fixed 'width' and 'height' attributes is beyond the scope of this report.