[Inkscape-user] Referencing another .svg file.

Hello:

I am using Inkscape to create button icons. Many of them are simple compositions of other images. For example, to make a 'new-window' icon I would like to reference the .svg file for a plus sign over a reference to the .svg file of a window.

Currently I create a new .svg file and copy-in the required elements. But, this makes it tedious to change an element (the plus-sign, for example) because I have to visit all of the files into which I copied it.

So, is it possible to place a live reference to one .svg file from another.

I am stuck on RedHat 4 using Inkscape 0.44 (Pity me.)

Bill