When provided, all files with this label will be checked out. When a label is not provided, files are checked out from the view at the current point in time.

If the label contains %{<format>:BUILD_NUMBER} the label will be interpreted as a format string for a build label which will be created on the StarTeam server and then checked out. For example, label "build.%{d:BUILD_NUMBER}" will become the build label "build.42" for Jenkins build #42. The <format> is a Java format string. Other examples: