Cross-version references

[myshkin5]

We deploy multiple versions of our content and occasionally we need to make cross-references between the versions. For instance, I might have versions 1.11 and 1.14 deployed to the same server. Both versions have a docs/content.md file. With both versions deployed, I can browse to /1.11/content.html and /1.14/content.html. Then in another 1.14 page I want to refer to /1.11/content.html with something like this (on a docs/parent.md file in 1.14):

[1.11 content](/1.11/content.html)

Unfortunately this results in a link to /1.14/parent.html#/1.11/content.html. Note these references must still be relative to the server they are deploy to (can't start with https://).

We tried using the attrs_inline MyST extension and adding {.external} to the end of the markdown reference as in:

[1.11 content](/1.11/content.html){.external}

This got rid of the myst.xref_missing warning (which was good) but the link was still /1.14/parent.html#/1.11/content.html.

What should our markdown look like to form a proper cross-version reference?

Thanks!