Tags and Categories are undifferentiable in Atom and RSS feeds

[znarfor]

In RSS feeds this can be achieved using the 'domain' attributes of the category element. This is already done in Wordpress export through the wxr_post_taxonomy function, so we just have to do the same in RSS feeds.

In Atom feeds this can be achieved using the 'scheme' attributes of the category element. The Atom standard is not explicit about what to put in this scheme attributes. There is ​an interesting topic on Edward O’Connor blog. In my proposed patch, i decided to use the 1st representation and i also considered seriously the 2nd.

In the patch, i'm also adding the 'label' attribute to the atom category element and changed the 'term' attribute to be the tag slug. Seems this are currently the best practices in the Atom community.

i tried to not modify too much the function to improve the patch readability, but i think this function can be refactorised somehow after.

#9236 attempts to fix the same issue.

broken patch

This report will be fixed if the patch from #9510 is accepted.

update of my previous patch

The patch had been updated for 2.9-rare (trunk).

Lack of community testing on new patch > punting due to being in beta.