Multiple 'layer' parameters can be sent by simply putting a comma between them: 'layer=meta,high' or 'layer=low,high'. This results in all of the data requested being returned in the same line, so you would first split them by a pipe, then a second split by a tilde. The first element of each segment is the layer_code, so inspecting the first four characters will tell you which segment you're working with. Splitting each of these segments by an asterisk will get each of the elements.
NOTE: the order in which the layer strings occur does not affect the output order. 'layer=meta,high' will have the same result as 'layer=high,meta'. The output order is always: Header, Meta, Other, Low Verbosity, High Verbosity
hd*espn***3*news*news*head,meta,low*20141116*1123*220.127.116.11*2014.11.16.12~|mt*ESPN.com*Latest news from ESPN.com*en-us*Sun, 16 Nov 2014 08:23:27 PSTfirstname.lastname@example.org*30*Copyright 2014*hourly*1*2000-01-01T12:00+00:00~|lo*00*Rich Cimini*Postgame profanity costs Jets' Ryan $100K*Sat, 15 Nov 2014 06:59:45 PST*http://espn.go.com/new-york/nfl/story/_/id/11875719/rex-ryan-new-york-jets-fined-100k-postgame-profanity~lo*01*Brett McMurphy*Source: Gators' Muschamp out after season*Sun, 16 Nov 2014 08:20:14 PST*http://espn.go.com/college-football/story/_/id/11885343/will-muschamp-return-florida-gators-coach-next-season~lo*02*ESPN.com news services*Peterson: NFL is being unfair, ignoring CBA*Sun, 16 Nov 2014 07:23:15 PST*http://espn.go.com/nfl/story/_/id/11885147/adrian-peterson-minnesota-vikings-says-nfl-being-unfair-ignoring-cba~|