How to "use" local "defs" in SVG

An SVG file with multiple identical IDs is invalid per http://www.w3.org/TR/SVG/struct.html#IDAttribute

Your options are either make all the IDs unique or move the SVG into separate files and reference them via <object> or <iframe> tags.

I created a tool to randomize definition id's to avoid this issue with inline svg's referencing the same #id, hopefully it will be useful for someone else. http://hugozap.com/randomize_svg_def_ids.html