Data structure of the STK metadata. Each project consists of several sources, which in turn contain bibliographic information and one or more source trees. The blue boxes show the hierarchy for a single source tree. The data structure has been simplified here and more meta data can be stored for each source tree.

  Part of: Hill J, Davis K (2014) The Supertree Toolkit 2: a new and improved software package with a Graphical User Interface for supertree construction. Biodiversity Data Journal 2: e1053.