Hi,

let $doc := <html><head><title>Example Title</title></head><body><p>Paragraph</p></body></html>

return serialize($doc, map{"method":"xhtml", "version":"5.0"})

results in

[SESU0013] Invalid 'version' value '5.0'; must be one of: 1.0,1.1.

How can I make sure, I get the <!DOCTYPE html> and all empty elements closed?

As far as I remember, the W3C has ratified an XHTML serialization of HTML5 as legit part of the HTML5 spec (replacing the "Polyglot HTML5" term).

Minden jót, all the best, Alles Gute,
Andreas Mixich