h2. Resource
-Collections describe sets of files in terms of data blocks stored in Keep. See "Keep - Content-Addressable Storage":{{site.baseurl}}/architecture/storage.html for details.
+Collections describe sets of files in terms of data blocks stored in Keep. See "Keep - Content-Addressable Storage":{{site.baseurl}}/architecture/storage.html and "using collection versioning":../../user/topics/collection-versioning.html for details.
Each collection has, in addition to the "Common resource fields":{{site.baseurl}}/api/resources.html:
h3. get
-Gets a Collection's metadata by UUID or portable data hash. When making a request by portable data hash, attributes other than @portable_data_hash@ and @manifest_text@ are not returned, even when requested explicitly using the @select@ parameter.
+Gets a Collection's metadata by UUID or portable data hash. When making a request by portable data hash, attributes other than @portable_data_hash@, @manifest_text@, and @trash_at@ are not returned, even when requested explicitly using the @select@ parameter.
Arguments: