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The CRS Catalog Service enables end-users to make CRS selections, search for CRSs given a number of constraints, download of the entire catalog for local caching, and access to various sub-sets of the catalog.

The CRS Conversion Service provides spatial reference conversions for coordinates. Coordinates are represented by an array of 3D points.

The Unit Service provides dimension/measurement and unit definitions. Given two unit definitions, the service also offers conversion parameters in two different parameterizations.

The Notification service allows interested consumers to subscribe to data and metadata changes using a publish/subscriber pattern.

Docs: https://osdu.pages.opengroup.org/platform/system/notification