I'm pretty sure that if I call `POST /articles/{articleId}/publish`, it will publish the article with ID `{articleId}`. Whereas I'm not sure how `/articles/published/` works.
That's actually a REST feature. You have to interact with /articles/published to get its media type and then based on that you will know what you can do with it. The URI shouldn't matter. It could be /4234234/224234324/020121020/xxxxAAAAzzz but if the media type is "published articles" which is defined in the API spec, then you will know what to do with it.