feImage image sizing

http://www.w3.org/TR/SVG/filters.html#feImage

If the xlink:href references a stand-alone image resource such as a JPEG,
> PNG or SVG file, then the image resource is rendered according to the
> behavior of the 'image'<http://www.w3.org/TR/SVG/struct.html#ImageElement>element
>

For the <image> element, 'width' and 'height' are required attributes that
define the size of the viewport into which the image is rendered. <feImage>
doesn't have these attributes, so how should the image viewport be sized? If
the image viewport is supposed to be (0,0)-(100%,100%) of the user
coordinate system established by the value of 'primitiveUnits' on the
'filter' element, I think the spec needs to be clarified to say so
explicitly.

Rob
-- 
"He was pierced for our transgressions, he was crushed for our iniquities;
the punishment that brought us peace was upon him, and by his wounds we are
healed. We all, like sheep, have gone astray, each of us has turned to his
own way; and the LORD has laid on him the iniquity of us all." [Isaiah
53:5-6]