# Presentation: 401143

## METS repositories: DSpace

- MacKenzie Smith
- Associate Director for Technology
- MIT Libraries

- Copyright MIT, 2003

- October 28, 2003

## DSpace

**DSpace**

- Open source dynamic digital repository

- Visual Explanations by **Dynamic Diagrams**

- Copyright MIT, 2003

- October 28, 2003

## Institutional Repository

- Institution-based
- Scholarly material in digital formats
- Cumulative and perpetual
- Open and interoperable

- Copyright MIT, 2003

- October 28, 2003

## The DSpace Repository

- Institutional Repository created at MIT for faculty digital research materials
- MIT Libraries - Hewlett Packard Research Labs collaborative development
- Open Source system
- Federated system
- Preservation archive platform

- Copyright MIT, 2003

- October 28, 2003

## DSpace

- Captures
- Digital research material in any formats directly from creators (e.g. faculty)
- Describes
- Descriptive, technical, rights metadata
- Persistent identifiers
- Distributes
- Searches metadata
- Delivers via Web, with necessary access control
- Preserves
- Large-scale, stable, managed long-term storage

- Copyright MIT, 2003

- October 28, 2003

## Possible Content

- Preprints, articles
- Technical Reports
- Working Papers
- Conference Papers
- E-theses
- Datasets
- e.g. statistical, geospatial, scientific

- Images
- visual, scientific, etc.
- Audio files
- Video files
- Learning Objects
- Digitized library collections

- Copyright MIT, 2003

- October 28, 2003

## OAIS framework

- Copyright MIT, 2003

- October 28, 2003

## METS and OAIS

- Submission Information Package (SIP)
- METS as transfer syntax
- Dissemination Information Package (DIP)
- METS as tranfer syntax
- METS as input to display applications
- Archival Information Package   (AIP)
- METS stored internally in archive

- Copyright MIT, 2003

- October 28, 2003

## Slide 9

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- October 28, 2003

## OAIS at MIT

- OAIS influence on Dspace design
- DSpace repository to contains AIPs
- AIPs contain
- Descriptive Information (Dublin Core metadata)
- Representation Information (technical metadata about digital files)
- Content Information (digital objects)
- DSpace AIP = METS file

- Copyright MIT, 2003

- October 28, 2003

## DSpace Information Model

**Communities**
- Research units of the organization
**Collections** (in communities)
- Distinct groupings of like items
**Items** (in collections)
- Logical content objects; receive persistent identifier
**Bitstreams** (in items)
- Individual files; receive preservation treatment

- Copyright MIT, 2003

- October 28, 2003

##  DSpace Metadata

**Descriptive** metadata
- Qualified Dublin Core
- Based on Library Application Profile
**Administrative** metadata
- Minimal information in DC metadata
**Technical/preservation** metadata
- Mime type, file name, file size, create date, MD5 checksum

- Copyright MIT, 2003

- October 28, 2003

## DSpace METS Profile

- METS instances map to DSpace ***items***
- <METS:mets
- OBJID="DspaceID"
- TYPE="mime/type"
- LABEL="DSpace item">

- Copyright MIT, 2003

- October 28, 2003

## METS Header

- <metsHdr
- CREATEDATE="2002-10-20T15:40:00">
- 	<agent ROLE="AIP“ 	TYPE="ORGANIZATION">
- 		<name>Massachusetts Institute of 	Technology</METS:name>
- 	</agent>
- </metsHdr>

- Copyright MIT, 2003

- October 28, 2003

## Descriptive Metadata

- <dmdSec ID="DMD DSpaceID">
- 	<mdWrap>Qualified Dublin Core metadata </mdWrap>
- </dmdSec>
- Need an “extension schema” for DC using the Library Application Profile

- Copyright MIT, 2003

- October 28, 2003

## Administrative Metadata

- <amdSec ID="TMD DSpaceID">
- 	<techMD>DSpace technical metadata </techMD>
- 	<rightsMD>DSpace use license</rightsMD>
- 	<digiprovMD>DSpace administrative and technical metadata</digiprovMD>
- </amdSec>
- Need an extension schema for DSpace tecfhnical metadata elements (e.g. mime-type, file name, file size, checksum)

- Copyright MIT, 2003

- October 28, 2003

## Provenance Metadata

- METS digiprovMD maps to DSpace history subsystem metadata
- use the ABC Harmony schema as the METS digiprovMD extension schema
- tracks the item over time
- history system records can be dropped into a digiprovMD/mdWrap section as plain XML or RDF/XML

- Copyright MIT, 2003

- October 28, 2003

## File Inventory

- File inventory maps to a DSpace ***bundle***
- <fileSec>
- 	<fileGrp id=“DSpaceID” ownerid=“MIT” mimetype=“mime/type” seq="1" created=“2002-10-20T16:00:00” size=“nnn” checksum=“nnnnnnnnnn” admid=“ADMDSpaceID” use=“preview”>
- 		<file id=x>preview PDF</file>
- 	</fileGrp>
- 	<fileGrp use=”full view”>
- 		<file id=y>full PDF</file>
- 	</fileGrp>

- Copyright MIT, 2003

- October 28, 2003

## File Inventory

- 	<fileGrp use=“image master”>
- 		<file id=a>page 1 TIFF</file>
- 		<file id=b>page 2 TIFF</file>
- 	</fileGrp>
- 	<fileGrp use=“text master”>
- 		<file id=j>page 1 OCR</file>
- 		<file id=k>page 2 OCR</file>
- 	</fileGrp>
- </fileSec>

- Copyright MIT, 2003

- October 28, 2003

## File Inventory

- In this example the TIFF and OCR files were used to create PDF deliverables, but are kept as archival masters, not displayed to the public.
- In practice, sets of TIFF and/or OCR files can be deposited as a single zip file in a separate bundle (i.e. filegrp) and suppressed from public display based on “use” value.
- If a TIFF page turner is available, a separate structmap for that view can be created with a hierarchy of divs to model the item sections.

- Copyright MIT, 2003

- October 28, 2003

## Structure Map

- DSpace item bundles map to a structMap for public display (i.e. a logical item view)
- <structMap ID="DSpaceID"  type=”logical”>
- 	<div><fptr fileid=x/></div>
- </structMap>
- <structMap type=”logical”>
- 	<div><fptr fileid=y/></div>
- </structMap>

- Copyright MIT, 2003

- October 28, 2003

## Structure Map

- Separate structMaps for each bundle will simplify production of DIPS for different logical views of the item.

- Copyright MIT, 2003

- October 28, 2003

## DSpace METS AIPs

- METS files will be produced on installation into the DSpace assetstore

- Copyright MIT, 2003

- October 28, 2003

## Content packaging

- Content can be embedded into a METS file or packaged together with METS file
- AIP should have content embedded (very large files result)
- SIP and DIP should keep content files separate for ease of transmission
- Possible alternatives: IMS Content Packaging specification

- Copyright MIT, 2003

- October 28, 2003

## DSpace METS SIPs

- OpenCourseWare
- e.g. IMS Content Packages converted to METS
- Imports from other DSpace instances
- e.g. to aid in assetstore replication for backup
- Imports from other Institutional Repositories
- e.g. FEDORA, Eprints, Greenstone,
- Publishers?

- Copyright MIT, 2003

- October 28, 2003

## DSpace METS DIPs

- Manage custom “delivery applications”
- Take a DSpace AIP
- Modify or simply as needed
- Send to custom rendering application
- Could be internal or external (e.g. remote Web Service)

- Copyright MIT, 2003

- October 28, 2003