Simple XLinks are "supported" in Firefox (at least in SVG and MathML), though they do not work as links if one loads a plain XML document with XLinks and attempts to click on the relevant points in the XML tree.

For those who may have found XLink 1.0 cumbersome for regular links, XLink 1.1 drops the need to specify xlink:type="simple" for simple links.

XLink is used in SVG , MathML , and other important standards.