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The validator claims that, to be valid SVG, one must declare a !DOCTYPE. While such is allowed in the SVG spec, it is not only not required, but is even actively discouraged in the current spec: http://www.w3.org/TR/SVG/intro.html#NamespaceAndDTDIdentifiers I realized that the SVG parser is essentially in beta, as the warnings always state. But that's all the more reason to report a bug. The SVG tag with its namespace and version declarations should be sufficient to identify the document as SVG 1.1 for the purpose of validation.