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Amazon Simple Workflow Service
Developer Guide (API Version 2012-01-25)

Amazon SWF Domains

Domains provide a way of scoping Amazon SWF resources within your AWS account. All the components of a workflow, such as the workflow type and activity types, must be specified to be in a domain. It is possible to have more than one workflow in a domain; however, workflows in different domains can't interact with each other.

When setting up a new workflow, before you set up any of the other workflow components you need to register a domain if you have not already done so.

When you register a domain, you specify a workflow history retention period. This period is the length of time that Amazon SWF will continue to retain information about the workflow execution after the workflow execution is complete.