The XaaS blueprints can be published as catalog items or used in the blueprint designer. The resource actions are action that you run on provisioned items.
XaaS is uses vRealize Orchestrator to run workflows that provision items or run actions. For example, you can configure the workflows to create vSphere virtual machines, Active Directory users in groups, or PowerShell scripts. If you create a custom vRealize Orchestrator workflow, you can provide that workflow as an item in the service catalog, allowing the entitled users to run the workflow.