yEd version 3.11.1 causes a new non-conformant attribute value to be output when exporting SVG files from yEd (see one sentence description).
I encounter this when attempting to process the resulting SVG with FOP as part of my docbook-based workflow, which produces an annoying stack trace for every instance encountered.
yED 3.11 does not produce include this attribute value in the SVG output, and FOP handles the output nicely.