Amost one month ago now I started transcribing the 2015 edition of the ISM, back into my (somewhat dated now) XML source format.
Today I finished, and I give you the new Freshly-minted ISM2015-04 for your consumption pleasure.
I'll be updating the tree-view in the coming days, as I like to tweak.
Update
The new Document Tree has been updated - Render and print this for your wall.