svg role="img" causes EPUB2 validation error

[asylumcs]

Both attached files have HTML+SVG images of the same 3 formulas. Epubmaker generates and EPB2 and EPUB3 for both. Both EPUB3s validate. Only the first one validates as EPUB2. The second zip has role="img" as an SVG attribute.
I would like set role="img" on the outer [<svg>] element and give it a label. This should cause screen readers to just consider it as a single entity and describe it using the label, rather than trying to read out all the child nodes.
test02-ebm1.zip
test02-ebm2.zip

[eshellman]

this issue is discussed here: w3c/epubcheck#769 It's an unfortunate choice they made.
in our implementation for inline svg, I am removing the role attribute from the svg element for epub2. this allows the role attribute to be used for epub3; there's no way to avoid the epub2 validation error if the svg file is external.