This is an archived snapshot of W3C's public bugzilla bug tracker, decommissioned in April 2019. Please see the home page for more details.
Just like XHTML, SVG needs a mandatory xmlns attribute on the root element. Unlike XHTML, the validator doesn't give a warning if it is missing. I suggest this should be resolved just like Bug #68, even though namespace handling remains an awkward issue.
According to comments in validator's config files, until SVG 1.1 2nd edition the spec wasn't quite clear whether the namespace is required or not. But as of 2nd ed it now is, and the next version of validator (1.3) will start to flag omission of it as an error.