This package highlights the UCSC Genome Browser Track Hub files.
See http://genome-asia.ucsc.edu/goldenPath/help/hgTrackHubHelp.html for information on track hub files.
Also see http://genome-asia.ucsc.edu/goldenPath/help/trackDb/trackDbHub.html for the settings available for track hub files. Note that not all of the settings have been implemented in the language yet, but the majority of important and common ones have.
Good catch. Let us know what about this package looks wrong to you, and we'll investigate right away.