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 ## WIP, Puzzles and TODO
 
-* [done] Pos can't include elevation if it's sometimes unknown
 * do we even need Track? will it ever be anything more than a collection
  of Points?
-* [done] need a real gpx file with namespace decls before we can parse power and stuff
-* [done] tests seem to pass without <gpx> element?
-* [done] stop returning bogus data when missing required elements (e.g. time)
 * can we lose this "if isJust lat && isJust lon && isJust ts" wart?
 * probably we should store points in a more efficient form than
  a singly-linked list