I browsed the tags today and realised there are few descriptions added.
For svg I looked at the description on StackOverflow and (of course) it is relatively complete, just not e-book specific. I started with copying that description (and the one-liner), thinking that updating it with e-book specific information is better than re-inventing the wheel from scratch. I indicated the source at the bottom of the description.
Is that acceptable? Should I always immediately add e-book specific information (in this case that EPUB 3.0 supports SVG), or is it OK to have the (of course valid) basics so it can be improved upon later on?