404 not found on url https://www.w3.org/2004/08/xop/include

Hi,

I didn't find how to report this elsewhere, sorry, but I found a 404 
error in the https://www.w3.org/TR/xop10/#xop_include section of w3.org 
documentation.

This sections mentions the url https://www.w3.org/2004/08/xop/include 
which doesn't exist anymore (since today?). This URL is also referenced 
in the Onvif Specification (here: 
https://www.onvif.org/ver10/schema/onvif.xsd).

I suppose there is someone already working on this issue. FYI I opened 
an issue in StackOverflow about it (here 
<https://stackoverflow.com/questions/72488780/onvif-compilation-error-with-missing-page>)

Regards,

Julien Gréard