Like the title says, SVG icons should be rendered to PNG icons in the appropriate (64x64px) size, there should be no SVG(Z) shipped in the icons tarball.
Also, the PNGs should be resized to the size of the directory they are in, so 48x48 icons are scaled up or larger icons are scaled down to fit 64x64px. Same applies for 128x128 icons.
Like the title says, SVG icons should be rendered to PNG icons in the appropriate (64x64px) size, there should be no SVG(Z) shipped in the icons tarball. Also, the PNGs should be resized to the size of the directory they are in, so 48x48 icons are scaled up or larger icons are scaled down to fit 64x64px. Same applies for 128x128 icons.