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Name	Transaction support
Description	A pattern that guarantees the state of the repository (Fedora + associated indexes) after a mutating operation completes
Use cases	In the Recover from failed package deposit use case, one option for handling failed deposits is to roll back the deposit as if it never occurred. In the Content Modeling use case, roll back the deposit of an object if it cannot be successfully transformed upon POST Rolling back a deposit in the Content Validation use case if an incoming object cannot be successfully validated
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Name	Selection and Filtering of Fedora resources or requests
Description	A pattern that allows for selecting Fedora resources and/or requests by some criteria
Use cases	In the signposting use-case, selecting which responses are to be filtered In the content and structural validation use case, selecting which objects are subject to validation. in the Earth Sciences OpenSearch use case, knowing which collections are amenable to Earth Science OpenSearch queries.
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