jksrc / trackDB.ra / Container tracks
とかいいながら、compositeと同じようにグルーピングするスキームとして、'container'というのがある。aggregateできる、ということらしいので、最近ENCODE regulation track用に追加されたコンセプトなのかもしれない。
Container tracks are yet another way of grouping tracks together. The top level container track includes a tag of the form containerwhere currently the only container-type is "multiWig" which may only contain wig and bigWig tracks. The advantage of using "container multiWig" instead of a composite track is that container multiWig supports the "aggregate" tag that allows multiple wiggle graphs to be drawn in the same vertical space.
たとえばこんな感じ
track wgEncodeRegMarkPromoter container multiWig shortLabel Promoter H3K4Me3 longLabel ENCODE Promoter Histone Mark (H3K4Me3) on 9 Cell Lines type wig 0 30000 viewLimits 0:100 configurable on visibility full maxHeightPixels 100:30:11 aggregate transparentOverlay showSubtrackColorOnUi on windowingFunction mean priority 1.4 track wgEncodeRegMarkPromoterGm12878 shortLabel Gm12878 longLabel Promoter Histone Mark (H3K4Me3) on Gm12878 cells from ENCODE parent wgEncodeRegMarkPromoter type wig 0.00 100593.50 color 255,128,128 track wgEncodeRegMarkPromoterH1hesc shortLabel H1 ES longLabel Promoter Histone Mark (H3K4Me3) on H1 cells from ENCODE parent wgEncodeRegMarkPromoter type wig 0.00 12434.00 color 255,212,128