A cartridge group, is a metadata that you can define by grouping several cartridges together. Composite applications in Stratos, support nested groups within a group as inter-dependencies among group members. Cartridge groups define the relationship among a set of groups and a set of cartridges. The relationship among the children of a group can be start up order, termination behavior and any scalable dependencies. Writing a group definition provides the ability to re-use the same frequently used group as needed in different composite applications. The following sub-sections describe how to work with cartridge groups via the CLI, UI and REST API: