atlasapi/atlas-model — pull request #129 by fredvdd (2013-07-11 10:57:10+00:00)
Title: Expose simple Item's Broadcasts as a NavigableSet not SortedSet

Simple Items contained a TreeSet of Broadcasts. Expose this as a
NavigableSet rather than SortedSet on Item's interface.

Means that Atlas is Java 1.6+.