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![Page 1: CWSpace Archiving Courseware Websites to DSpace Using a Content Packaging Profile & Web Services © Digital Library Federation Spring Forum, 2006 April.](https://reader036.fdocuments.in/reader036/viewer/2022062517/56649f165503460f94c2cfc2/html5/thumbnails/1.jpg)
CWSpaceArchiving Courseware Websites to DSpace
Using a Content Packaging Profile
& Web Services
©
Digital Library Federation Spring Forum, 2006
April 11, 2006 — Austin, Texas
William Reilly, Rob Wolfe — MIT Libraries
2006
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DLF Spring 2006 MIT's CWSpace 2
Project Overview
Vision: Increase value in Institute publication: OCW– Also: Increase
value in Open Source platform: DSpace
* CLE = Collaborative Learning Environment
Goal: Archive OCW to MIT’s DSpace– Also: Make content
available to CLEs *
CWSpace: MIT iCampus project, nearing completion
Method: Interoperability of systems– Use Content Packaging standard– Use Web Services standard
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DLF Spring 2006 MIT's CWSpace 3
Perceived Need: inter-operability™
• Obvious observation: Higher Ed. Technologies increasingly seeking integration with Library & Repository holdings
• Not so obvious(?): Libraries seeing their charter to include collection, preservation, dissemination of Teaching & Learning materials (?)
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DLF Spring 2006 MIT's CWSpace 4
InterOp: What’s Available
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DLF Spring 2006 MIT's CWSpace 5
InterOp: What’s Achievable 1 of 3
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DLF Spring 2006 MIT's CWSpace 6
InterOp: Challenges 2 of 3
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DLF Spring 2006 MIT's CWSpace 7
InterOp: Possible Resolution? 3 of 3
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DLF Spring 2006 MIT's CWSpace 8
OCW Materials in DSpace = New Ground
Educational Materials Digital Archive
New kind of content: educational, teaching, learning
POLICY - Cost/merit evaluation of archival treatment. Preservation and IP considerations
New emphasis (ideally) on re-use, re-purposing: aggregation, disaggregation
GRANULARITY - Challenge to digital archive; how flexible can it be? (cf. CMS)
New kind of structure, composition: website, compound digital object, rich metadata
COMPLEXITY - Need to package multi-file content, plus metadata
Content PackagingNew needs for system-to-system access: CLEs, Image Tools
BACK-END / FRONT-END - Need for networked access
Web Services
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DLF Spring 2006 MIT's CWSpace 9
Content Packaging
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DLF Spring 2006 MIT's CWSpace 10
Content Packaging: Steps Toward a Profile
• Model OCW Content
• Choose Packaging Specification
• Profile That Specification
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DLF Spring 2006 MIT's CWSpace 11
Content Package
Package Interchange File (PIF)
• Usually a .zip file• Contains a manifest• Manifest references
files (some in, some out of the package)
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DLF Spring 2006 MIT's CWSpace 12
Object Models
• Mapping one world to another
• Content Package design considerations
• Use, re-use, subsequent disseminationOCW DSpace
SIP DIP
…
…
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DLF Spring 2006 MIT's CWSpace 13
OCW to DSpace mapping
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DLF Spring 2006 MIT's CWSpace 14
Which Packaging Spec.?
• Content packaging specifications are generic loose envelopes to carry content, metadata
• Choice of package is largely determined by user community
• Dspace to use METS internally• Higher Education uses IMS
Content Packaging
• METS• IMS-CP• MPEG-21
DIDL• XFDU
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DLF Spring 2006 MIT's CWSpace 15
METS and IMS-CP
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DLF Spring 2006 MIT's CWSpace 16
IMS-CP & OCW Content Model
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DLF Spring 2006 MIT's CWSpace 17
IMS-CP & DSpace Object Model
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DLF Spring 2006 MIT's CWSpace 18
OCW to IMS-CP to DSpace
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DLF Spring 2006 MIT's CWSpace 19
Profiling Package Standards
Every Implementation of IMS-CP or METS will:
• Constrain the Standard• Extend the Standard• Interpret the Standard
The sum of these adjustments is the implementation profile
The Standards themselves encourage profiling in a systematic way:
IMS Application Profile Guidelines Technical Manual
http://imsglobal.org/ap/apv1p0/imsap_techv1p0.html
METS Profile Schema and Guidelines
http://www.loc.gov/standards/mets/mets-profiles.html
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DLF Spring 2006 MIT's CWSpace 20
Application Profiles
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DLF Spring 2006 MIT's CWSpace 21
Application Profiles
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DLF Spring 2006 MIT's CWSpace 22
Application Profiles
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DLF Spring 2006 MIT's CWSpace 23
Application Profiles
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DLF Spring 2006 MIT's CWSpace 24
Application Profiles
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DLF Spring 2006 MIT's CWSpace 25
Profiled Content Package…
Now with Package defined…
…need to move that across the network from producer to consumer… DSpace
Content Provider
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DLF Spring 2006 MIT's CWSpace 26
Web Services
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DLF Spring 2006 MIT's CWSpace 27
DSpace dev: LNI & PKGers
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DLF Spring 2006 MIT's CWSpace 28
Lightweight Network Interface
0. What Was The Problem?
1. What Is the LNI?
2. DSpace & WebDAV
3. Example of Use: Submit OCW
4. Future Development…
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DLF Spring 2006 MIT's CWSpace 29
What was the Problem…?Content Providers wanted…• Networked Access: Programmatically access the DSpace object model, but not
running on the DSpace server
Basic (Lightweight Network Interface (LNI))
[ Access, Deposit, Limited Mods. ]
• Submit
• Retrieve Item w. Metadata
• Build own U/I
• Collection Mgt, Map Items
Advanced (possible future LNI dev.)
[ Replace, Withdraw, Delete ]
• Specialist metadata
• Automated metadata
• Quality control checks
• Format migration …
DSpace
Content Provider
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DLF Spring 2006 MIT's CWSpace 30
What Is the LNI?
The "Lightweight Network Interface" is:
• A remote API to control DSpace
• It's essentially WebDAV: Extensions to HTTP
– A SOAP (with WSDL) equivalent is provided
• It's a mapping: —
– a "complete and comprehensive" view of the DSpace public object
API…
(the "business logic" layer)
– …as mapped to WebDAV semantics
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DLF Spring 2006 MIT's CWSpace 31
DSpace: Model• DSpace digital repository• Differs from file system• Submit URI not known• Workflow• …
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DLF Spring 2006 MIT's CWSpace 32
WebDAV: Model, Basics• Each Resource
named by a URL
• Properties are "name value" pairs
• Properties are extensible
• Property values can be found, and modified
DAV = "Distributed Authoring and Versioning"
URL
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DLF Spring 2006 MIT's CWSpace 33
WebDAV: Model, Fuller• Resources
can be Collections or leaf nodes
• Collections can nest
• Everything can be discovered descending from the DAV server's root '/' resource
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DLF Spring 2006 MIT's CWSpace 34
DSpace Mapped to WebDAV• WebDAV
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DLF Spring 2006 MIT's CWSpace 35
DSpace Implemented as WebDAV
1. Properties– WebDAV– Custom for DSpace
2. LNI URLs
3. WebDAV Methods
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DLF Spring 2006 MIT's CWSpace 36
Properties: WebDAV
• DAV:creationdate• DAV:displayname• DAV:getcontentlength• DAV:getcontenttype• DAV:getlastmodified• DAV:resourcetype• …
http://www.webdav.org/specs/rfc2518.html
Akin to file system properties,with add'l. metadata
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DLF Spring 2006 MIT's CWSpace 37
Properties: Custom DSpace (1 of 3)
• ALL DSpace Objects:– dspace:type
• "BITSTREAM", "ITEM", "COMMUNITY" etc.
– DAV:resourcetype • "COLLECTION" etc.
– dspace:displayname– dspace:current-user-privilege-set
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DLF Spring 2006 MIT's CWSpace 38
Properties: Custom DSpace (2 of 3)
• Community DSpace Objects– dspace:logo– dspace:short_description– dspace:side_bar_text– dspace:handle– …
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DLF Spring 2006 MIT's CWSpace 39
Properties: Custom DSpace (3 of 3)
• Bitstream DSpace Objects– DAV:getcontentlength = getSize()– dspace:format = getFormat().getID()– dspace:sequence_id = getSequenceID()– …
• Many more DSpace Objects (some 10)– With many more Properties (some 87)
http://wiki.dspace.org/LightweightNetworkInterface
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DLF Spring 2006 MIT's CWSpace 40
URLs: DSpace LNI• Community
– http://uni.edu/dspace/dav/dso_1721.1$46
• Collection– http://uni.edu/dspace/dav/dso_1721.1$349
• Item– http://uni.edu/dspace/dav/dso_1721.1$5543
• Bitstream– http://uni.edu/dspace/dav/dso_1721.1$5543/bitstream_13
The LNI URLs for DSpace objects are only for use with the LNI.
• They are therefore not to be used:
• as persistent URLs (e.g. bookmark, store for later use)
• as interactive URLs (e.g. browser)
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DLF Spring 2006 MIT's CWSpace 41
WebDAV Methods in LNI• PROPFIND - very powerful request with multiple functions:
– list names of properties– return property values– recurse through 1 or more levels of a "collection" resource.
• PROPPATCH - changes value of or deletes properties on one resource.• GET - retrieves contents of a resource• PUT - replace or add a new resource to a collection• COPY - map a resource ("Item") to a different Collection.
As noted, equivalent SOAP methods are provided
Not Implemented: Locking, Versioning.
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DLF Spring 2006 MIT's CWSpace 42
Current DSpace (pre-LNI)Content Provider, currently
• Batch import (& export)
• End user Web U/I
• dspace-admin Web U/I
• SRW, OAI-PMH
DSpace
Batch Importer
OCW Comm.
"Biology (7)"
"Physics (8)"
DSpace Object API
Web U/I Web, butNon Auto-
mated
Non Std.Non Web
Workflow Adm
Item
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DLF Spring 2006 MIT's CWSpace 43
DSpace with LNIContent Provider using LNI:• LNI SOAP end-point URL
• LNI WebDAV URLs
• dspace-admin (partial)
• SRW, OAI-PMH– (Not replicated in LNI)
• Still available: – Batch import (& export)– End user Web U/I
DSpace
DSpaceLNI.class
OCW Comm.
"Biology (7)"
DSpace Object API
DSpace LNI WebDAV
- Web.- Stds.
- Batch-able.
"Physics (8)"
Item
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DLF Spring 2006 MIT's CWSpace 44
Submission: OverviewOpenCourseWare Client
Needs 3 Values:
1. LNI SOAP end-point URL http://userid:[email protected]/dspace-lni/lni/DSpaceLNI
2. Handle for OCW Community = hdl:1721.1/125
3. Dept. Name (MIT "Course" Number) for Course to be submitted = "Physics (8)"
DSpace
DSpaceLNI.class
OCW Comm.1721.1/125
"Biology (7)"
DSpace Object API
DSpace LNI WebDAV
Lang. -Indep.
Platform -Indep.
"Physics (8)"
Item
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DLF Spring 2006 MIT's CWSpace 45
Submission: 1. LookupRequest: OCW Comm. HANDLE
LNI lookup() = http://dspace.mit.edu/dspace-lni/dav/lookup/handle/1721.1/125
Response: OCW Comm. LNI URL http://dspace.mit.edu/dav/dso_1721.1$125
DSpace
DSpaceLNI.class
OCW Comm.1721.1/125
dso_1721.1$125
"Biology (7)"dso_1721.1$197
"Physics (8)"dso_1721.1$253
DSpace Object API
DSpace LNI WebDAV
Lookup
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DLF Spring 2006 MIT's CWSpace 46
Submission: 2. CollectionsRequest: PROPFIND on LNI URL for children DSpace
Collections' "displaynames":<propfind>
<prop>
<DAV:displayname/>
</prop>
</propfind>
Response: MULTISTATUS<multiStatus>
<resource>
<href URI="dso_1721.1$197"/>
<displayname>Biology (7)</displayname>
</resource>
<resource>
<href URI="dso_1721.1$253"/>
<displayname>Physics (8)</displayname> </resource>...
DSpace
DSpaceLNI.class
OCW Comm.1721.1/125
dso_1721.1$125
"Biology (7)"dso_1721.1$197
"Physics (8)"dso_1721.1$253
DSpace Object API
DSpace LNI WebDAV
Iterate…
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DLF Spring 2006 MIT's CWSpace 47
Submission: 3. Submit (PUT)Request: PUT to DSpace Collection LNI URL,
including specification of Packager Type (IMS-CP):
PUT /dspace/dav/dso_1721.1$253?package=OCW-IMSCP
....package contents in body...
Response: LNI URL for DSpace Item in "Location" Header:
HTTP/1.1 201 OK
Location: http://dspace.mit.edu/dspace/dav/dso_1721.1$836
....other headers....
DSpace
DSpaceLNI.class
OCW Comm.1721.1/125
dso_1721.1$125
"Physics (8)"dso_1721.1$253
DSpace Object API
DSpace LNI WebDAV
IngestItemdso_1721.1$836
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DLF Spring 2006 MIT's CWSpace 48
Submission: 4. Item HandleRequest: PROPFIND on DSpace Item LNI URL for the DSpace
Handle:
<propfind>
<prop>
<dspace:handle/> </prop>
</propfind>
Response: Properties Requested
=== PROPERTIES Successfully returned:
dspace:handle = "hdl:1721.1/836"
DSpace
DSpaceLNI.class
OCW Comm.1721.1/125
dso_1721.1$125
"Physics (8)"dso_1721.1$253
DSpace Object API
DSpace LNI WebDAV
Reverse Lookup
Itemdso_1721.1$836
1721.1/836
OCW Content Mgt. System
Stores DSpace Handle
SQL Server Table: hdl:1721.1/836
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DLF Spring 2006 MIT's CWSpace 49
Submission: SummaryIn this 4-step OpenCourseWare
submission example, we've seen:• SOAP endpoint URL• Dspace Handles• Dspace LNI URLs• LNI Lookup() function• WebDAV Properties• WebDAV Methods• PROPFIND (LNI request)• MULTISTATUS (LNI response)• LNI "Reverse Lookup"• WebDAV Headers (Location;
Success/Fail)
DSpace
DSpaceLNI.class
OCW Comm.1721.1/125
"Physics (8)"1721.1/253
DSpace Object API
DSpace LNI WebDAV
Item1721.1/836
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DLF Spring 2006 MIT's CWSpace 50
Future Development
• Other Use Cases, Needs– Basic, Advanced …
• Other DSpace objects– Bitstream Format Registry– Metadata Registry …
• Other WebDAV methods– PUT (for Replacement)– DELETE– MKCOL …
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CWSpaceArchiving Courseware Websites to DSpace
©
Digital Library Federation Spring Forum, 2006
April 11, 2006 — Austin, Texas
William Reilly, Rob Wolfe — MIT Libraries
2006
Questions, & Etc.
http://cwspace.mit.edu/docs/ProjectMgt/Reports/MIT-CWSpace-DLF-Spring2006.ppt
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