Ch. 17.3 - Listing 17-18 - why does content() have the 2nd param?

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https://doc.rust-lang.org/book/ch17-03-oo-design-patterns.html

Listing 17-18

struct Published {}

impl State for Published {
    // --snip--
    fn content<'a>(&self, post: &'a Post) -> &'a str {
        &post.content
    }
}
  • Why is Published an empty struct, vs having a content-like property (let's say data) to store the final content?
  • Follow-up: Why does content() now have a post parameter? I get it has to do with Published being empty, and I understand the lifetime additions, but I do not see anywhere in the full code body where content is being called with a parameter. Why would I not reference a Published.data from the content method?
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