Sorry, I should clarify: I mean in the context of, say, a blog or website where a post (or page) might have multiple authors, with authors mentioning other authors in text. So, if "Ursula K. Le Guin" were a contributor to the site, if I were to mention "Le Guin" in a post, the site would know that "Le Guin" is the index term being used to refer to that particular contributor and clicking on their name would link to a page listing all their contributions to the site (posts, etc.). So, "for indexing purposes," I mean specifying that a particular part of an author's full name is the accepted shortened form for referring to them on the site.