age - List pages from the most recently created to the oldest.
mtime - List pages with the most recently modified first.
title - Order by title (page name), e.g. "z/a a/b a/c"
path - Order by page name including parents, e.g. "a/b a/c z/a"
meta(title) - Order according to the
[[!meta title="foo" sortas="bar"]]
[[!meta title="foo"]] directive, or the page name if no
full title was set.
In addition, you can combine several sort orders and/or reverse the order of
sorting, with a string like
age -title (which would sort by age, then by
title in reverse order if two pages have the same age).