Thanks for the links. BTW, the trailing ">" you are inserting is getting caught in HN's automatic linking and being inserted into the <A> tag.
RFC1738 - Uniform Resource Locators (URL) - recommends use of angle brackets in its "Recommendations for URLs in Context" appendix; when URLs are embedded in text.
Sure, but HN mangles the links. If this was email it might make more sense - or if HN's auto-parsing code were changed.
<http://www.aosabook.org/en/llvm.html>;
AOSA is now a two-volume book <http://www.aosabook.org>, with chapters providing overviews of 49 open source projects.