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They each provide a means to read and write persistent files with unique ids.
They were designed with back-end pluggability in mind.
They are not concerned with directory/folder semantics.
They are not concerned with versioning semantics, but may allow files to be overwritten.

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API	Language	Target Application(s)	Known Implementations
ALF-API: Alfresco ContentStore	Java	Alfresco CMS	ALF-FS: FileContentStore ALF-HTT: HttpAlfrescoStore ALF-REP: ReplicatingContentStore ALF-ROU: TenantRoutingFileContentStore
JKR-API: JackRabbit BLOBStore	Java	Apache JackRabbit	JKR-DB: DbBlobStore JKR-FS: FileSystemBLOBStore
DSY-API: Daisy BlobStore	Java	Daisy CMS	DSY-FS: FSBlobStore
BIT-API: DSpace BitStore	Java	DSpace 2 (Unreleased)	BIT-FS: DSBitStore BIT-SRB: SRBBitStore BIT-S3: S3BitStore BIT-FED: FedoraBitStore BIT-HON: HoneycombBitStore
LLS-API: Fedora ILowLevelStorage	Java	Fedora Repository (2.x to 3.1)	LLS-FS: GenericFileSystem LLS-IRD: iRODS LLS-HON: Honeycomb LLS-S3: S3 LLS-SRB1: SRB via Server Extensions LLS-SRB2: SRB via DART FedoraDB Module
XAM-API: SNIA XAM API	Java / C	Any Fixed Content Repository	XAM-CNT: EMC Centera XAM-IAP: HP IAP XAM-HON: Honeycomb
OTM-API: Topaz OTM BlobStore	Java	Topaz OTM	OTM-FED: FedoraBlobStore OTM-FS: SimpleBlobStore
EBS-API: Windows Sharepoint EBS	COM	MS SQL Server	EBS-FS: Custom Implementation
DJA-API: Django FileStorage	Python	Any Web Application	DJA-FS: DefaultStorage DJA-S3: S3

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