defines the legal namespaces of execution profiles. Different Schedulers on the Grid Different Grid Type's that can be supported by Pegasus. Mirror the Condor grid types. http://research.cs.wisc.edu/htcondor/manual/v7.9/5_3Grid_Universe.html Type of Jobs in the executable workflow this Grid Supports root element aggregating all sites information there is. Describes a single site Each site supports various (usually two) jobmanagers. The universe name is actually the primary key for the jobmanager identification. The contact string is the secondary key for any job manager. Each site may report to multiple LRCs. Administrative profile defaults associated with a site. Describes the fileserver to access data from outside Administrative profile defaults associated with a site. Defines the valid architecture types Defines the valid OS types Defines the attributes to define system information Defines the attributes to define directory such as internal path and size Defines a directory's external and internal view/mount-point and access parameters Different types of directories supported for a site Different types of operations supported by a file server