URI is the main locator syntax
Can use “?” query as part of the URI if server should do the work (inherent in URI spec)
href="http://blah.com?execute-this-and-return"
Can use “#” fragment identifier after the URI (if any) if client should do the work
href="http://blah.com#look-in-this-spot"
Can use “|” separator after the URI (if any) to signal no intent about the retrieval/processing model
href="http://blah.com|find-this-info"