Recently, I added a new paper to my personal website, and it appeared on Google Scholar a couple of days later. On my website, all I did was write the name of the paper, together with the authors and name of the conference, and then provided a link to the PDF. This information alone somehow informed Google Scholar that the text I added was actually a new paper. There is no other information about this paper on the web, so I know that Google only used my website to update Google Scholar.
So what I am wondering, is how does Google know what is a paper, and what is just some arbitrary text on my website? For example, if I had only written the name of the paper, without the authors and conference, and without the PDF, would this still have been detected?
On my website, the paper is listed on a webpage called "Publications", in a list with a load of other papers, but this is quite specific to the design of my own website. I'm wondering whether it has something to do with the PDF which I provided a link to. Perhaps it inspected the PDF and decided it was a paper, and if I hadn't added the PDF, it would not detect it as a paper. But then again, the HTML formatting does not necessarily indicate which text the PDF is actually associated with, even if it is obvious to a human on inspection of the webpage. Or perhaps Google Scholar just has some hand-engineered search which looks for instances of HTML where there is the name of a known conference, known authors, and a PDF nearby.