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The container registry serves as the centerpiece for collecting container information. Individual containers regularly post their monitoring information associated with their UUID and the container registry will keep track of that information relying on the persistence services defined in other bundles.

This component provides a way to express queries in a generic manner. Its centerpiece is a class called XMLQuery that uses boolean postfix expressions to capture the domain, range, and constraint of a query, regardless of the source of the query (SQL, keyword query, etc.). It can also encapsulate the results of a query. It's used by many other components as the standard way to pass a query and its results between servers, clients, nodes, and other components.