Chiming in to make sure this topic isn't forgotten. I rely on a custom xmlns and adding identifier attributes to do programmatic manipulation before final display of data. (Wouldn't mind using the id attribute, but that gets tricky sometimes - some operations create new objects with new id's, which ...

Thanks. The second topic is close - an API and UI for adding custom namespaces would be the next question. I found the relevant bug on launchpad: https://bugs.launchpad.net/inkscape/+bug/166004 So, for my particular purposes, as long as I'm happy to edit the xmlns in by hand, I just need to be sure ...

Running Inkscape 0.48.2 r9819 on Ubuntu, the program seems to eat away any custom xmlns I add to the svg tag. I've tried both editing one into the file with emacs, and using Inkscape's XML editor to add the property, then saving, closing, reopening. Has anyone encountered this? Is there a preferenc...