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Designing Digital Libraries, Museums, Archives
Howard Besser NYU Archiving and Preservation Program and Library Senior Scientist
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Designing Digital Libraries, Museums, Archives-
Models for Digital Repositories Importance of Metadata Standards & Philosophies Introduction Discovery Metadata: The Dublin Core Administrative & Structural Metadata; Digital Object Standards (METS) Fitting METS in--Content Management Content Format Standards (Images) Longevity & Preservation Repositories Other Elements Actors Metadata Preserving Electronic Art...
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Columbia Library
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Using Online Catalog for…
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Library Workstations for…
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Models for Digital Repositories
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From Digital Collections to Digital Libraries, Museums, and Archives
No longer merely experiments Adhere to our fields’ traditions (access, interoperability, sustainable, privacy, …) Provide services
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To respond to our needs for both Service & Traditions, we face the challenges of:
Access (discovery) Sustainability (longevity)- Interoperability-
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Serious Longevity Problems
What we know from prior widespread digital file formats Images separating from their metadata Inaccessibility of software needed to view an image Inability to even decode the file format of an image
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Traditional Digital Repository Model
DL DL DL DL search & presentation search & presentation search & presentation search & presentation user user
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Ideal Digital Repository Model
DL DL DL DL search & presentation user user
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Importance of Metadata Standards & Philosophies
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For Interoperability, Repositories Need Standards (as well as Sustainability & Access)
Descriptive Metadata for consistent description Discovery Metadata for finding Administrative Metadata for viewing and maintaining Structural Metadata for navigation ... Terms & Conditions Metadata for controlling access...
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Why are Standards and Metadata consensus important?
Managing digital files over time Longevity Interoperability Veracity Recording in a consistent manner Will give vendors incentive to create applications that support this
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Philosophical Metadata Decisions-
Warwick vs MARC Where to put the metadata
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Containers and Packages of Metadata Warwick, not MARC
modular overlapping extensible community-based designed for a networked world to aid commonality btwn communities while still providing full functionality within each community
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Some different schemes where Metdata is kept
embedded within the object (TIFF headers) encapsulated with image (MOA2/METS) in a separate related DB maintained by same organization (OPAC) in a separate DB maintained by a separate organization (Books in Print, ratings systems)
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Discovery Metadata Dublin Core - NISO Z39.85 (3/95)- CBIR (ongoing)
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Dublin Core--further work
Warwick Framework metadata packages for extensible functions layed groundwork for RDF Canberra Qualifiers refining the semantics of the element set to provide more precise info SUBELEMENT, SCHEME, LANG Granularity no hierarchical relationships w/i a given DC record; only one record per discrete object (collection or item-level), and relationship field plus qualifier links them
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The Research Process and Functional Categories of Metadata
Discovery Retrieval Collation Analysis Re-presentation
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Metadata Mapping Crosswalks Resource Description Framework (RDF)
Open Archives & metadata harvesting
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Crosswalks mapping btwn differing metadata structures
eliminate the need for monolithic, universally adopted standards focus on flexibility and interoperatiblity RDF-based metadata registries
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Crosswalk Example
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Resource Description Framework (RDF, spec released 2/99)
W3C Metadata activity designed to move the Web beyond simple links to semantically-rich relationships btwn resources metadata application using XML as a common syntax for exchange and processing flexible architecture for managing diverse application-specific metadata packets that can be processed by machines associates resources, property types, and corresponding values
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RDF Resources (character strings, names, digital objects)
Property (“is the author of”) Value resources+properties=relationships many different relationships can be reflected
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XML-encoded RDF <?xml:namespace ns= prefix="RDF" ?> <?xml:namespace ns= prefix="DC" ?> <RDF:RDF> <DC:Creator>Howard Besser</DC:Creator> </RDF:Description> </RDF:RDF>
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Open Archives & metadata harvesting
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Standardized Digital Objects
METS Metadata Encoding & Transfer Syntax (slides courtesy of Bernie Hurley, UCB Library Chief Scientist)
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Structural & Administrative Metadata
Not enough to merely capture still images (book example) Must capture Behaviors
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What is a “Digital Object?”
Combined Digital Content & Metadata Digital Content Digitized materials -- photographs, page images from a book, maps, digitized audio or video… Born Digital – GIS maps, digitally captured audio or video, numeric datasets (census files, scientific dataset), Web sites… Metadata Descriptive Administrative Structural Behavior 21
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What is METS? An XML Schema that is used to Encode all the Content and Metadata for a Digital Object The relationships between content and metadata are also captured METS Object -- METS Document A METS Document can be A single file with all content & metadata A “hub document” that points to content and metadata A combination of the above
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Uses of METS Transfer Syntax Functional Syntax Archiving Syntax
Standard for transmitting/ exchanging digital objects. SIP (Open Archival Information Systems Reference Model) Functional Syntax basis for providing end users with the ability to view and navigate digital content and its associated metadata DIP Archiving Syntax standard for archiving digital objects. AIP
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Why Is METS Important? Interoperability Scalability Preservation
Share objects between digital library systems Allow a DL to work with objects from other repositories Scalability Same software can be used to index, navigate and display different content types E.g., book, diary, scrapbook, music score, etc. Preservation Aids Migration Strategies
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History of METS Originates in Making of America II Initiative
Making of America II (MOA2) was a NEH funded Digital Library Federation initiative started in Participants included UC Berkeley (lead), Stanford, Penn State, Cornell, and NYPL. GOAL: to create a digital object standard for encoding structural, descriptive and administrative metadata along with primary content RESULT: MOA2.DTD (an XML DTD) Adopted by UC Libraries
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History of METS (cont’d)
Concerned Parties Meet at NYU in February, 2001 to Discuss Future of MOA2 Additional needs emerge Support for time-based content More flexibility in Descriptive and Administrative metadata Outcome MOA2 revised & renamed to METS Outcome: mets.xsd is endorsed by DLF METS Governance Structure Editorial Board, Jerry McDonough is Chair RLG coordinates editorial board activities Library of Congress is the Maintenance Agency for METS
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A Partial List of Organizations that Plan to Use METS
California Digital Library UC Berkeley Library of Congress (A/V project) Harvard NYU Stanford MIT MetaE (Metadata Engine Project: R&D project funded by the European Commission) British Library
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Display of METS Objects
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How Does METS Work? METS uses XML to
1) Identify the digital pieces (files) that together comprise a digital object Scrapbook: Digitized pages, photographs, newspaper clippings, digital audio, etc. 2) Specify the location of these pieces Are we pointing to these files? Are they embedded in the METS document? A combination of the above?
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Express structural relationships between:
[Think of the “structure” as a “Table of Contents”] Content files Links the proper content files to the TOC entry for the scrapbook’s cover, page1, page2, the photo on page20, the DVD on page 50, etc. Descriptive Metadata (DM) Links the proper DM entries to the TOC, so you can have separate DM entries for the scrapbook, photos, audio DVDs… Administrative Metadata (AM) Links AM entries to the TOC or to files (e.g., links rights MD to a photo, Tech. MD to a group of files) Behaviors Links the proper behaviors to TOC entries (e.g., links program to run the audio to the DVD TOC entry)
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Anatomy of METS METS METS Header Descriptive Metadata Admin. Metadata
(Optional) Descriptive Metadata (Optional) Admin. Metadata (Optional) File Inventory (Optional, but typical) Structural Map (Required) Behavior Metadata (Optional)
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1. METS Header Records Administrative Metadata about the METS Document itself, such as Author/agent & agent role E.G., UC Berkeley Library as custodian Alternate identifiers for METS document Creation and update dates and times Status
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2. Structural Map Section(s)
Specifies the Structure of the Digital Object as a Hierarchy of Division (div) Elements Division (type=“scrapbook”) Division (type=“page”) Division (type=“photo”) Division (type=“digital audio file”) Division (type=“letter”) Division (type=“newspaper clipping”)
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3. File Section Records all of the Files that Together Comprise the Content of the Digital Object Files may be internal or external to the METS document (or both) Files are organized into File Groups based on format (tiff, hi-res jpeg, med-res jpeg, gif, etc) Files are linked to the Structural Map
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3. File Section (cont.) Scrapbook Example (a complex object)
100 Digitized pages with text entries Three images per page (GIF, JPEG, TIFF) Transcribed text for each page Photos and newspaper clippings attached to the pages Envelopes glued to the pages that hold Letters & cards DVDs
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4. Descriptive Metadata Section(s)
METS can Record all of the Units of Descriptive Metadata Pertaining to the Digital Object Multiple Descriptive Metadata Sections can Exist in a METS Document Descriptive Metadata could take any form E.g., a MARC or Dublin Core record, Finding Aid May be Internal or external to the METS document (or both)
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5. Administrative Metadata Section(s)
4 Flavors of Admin. Metadata Per Section Technical metadata Source Metadata Rights Metadata Digital Provenance Metadata Admin. Metadata may be Internal or external to the METS document (or both) Linked to files or file groups, or the structural map
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6. Behavior Section Behavior Sections Identity Software that can be used with the Digital Object, or its Parts E.g., Software to View the Complex Digital Object which is the Scrapbook; Software to listen to the DVD A Behavior Unit May Contain: A reference to an external interface definition that defines a set of related behaviors A reference to an external executable that implements these behaviors A reference to the Division or Divisions of the object structure to which the behaviors apply.
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Some Characteristics of the New Information Environment
Increased Quantity of Information With the Web, everyone can become a publisher Varying level of quality Digital Libraries Need to Work With New Classes of Information Web Pages, Museum Artifacts, GIS, Statistical Information, etc. 10
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Characteristics of the New Information Environment (Cont.)
Information is Decentralized Distributed repositories Information is in Proprietary Formats Everyone has their own method of creating a digital book, journal, manuscript, Etc. How Do We Cope????
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Defining Digital Libraries in the NIE
A Series of Collaborating Services & Systems that Allow for the Discovery, Display, Maintenance and Preservation of Complex Digital Objects The Traditional ILS Created to manage physical materials Almost all metadata is descriptive (e.g., MARC) Digital Libraries Created to manage complex digital objects New types of metadata (administrative, structural, etc.) New Services (content management, digital preservation)
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Complex Digital Objects
Scrapbook Example Digitized pages with text entries Photos and newspaper clippings attached to the pages Envelopes glued to the pages that hold Letters & cards DVDs The Scrapbook has Multiple material types (text, image, audio) Structure (e.g., like a table of contents) Internal Relationships The DVD on page 5 is linked to the file that is the DVD content and to its descriptive metadata
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“A Series of Collaborating Services”
Content Management Systems (CMS) Create & maintain complex digital objects Preservation Repositories Long-term retention of digital objects Access Systems & Integration Global Access Portals Subject Access Portals Material Type Portals
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How Can These Systems Collaborate?
Via “Standardized Digital Objects” A means to “wrap-up” a digital object and send it to another system or repository Same idea as MARC, but for entire digital objects E.g., A CMS sending a digital object to a Preservation Repository The METS Digital Object Standard Metadata Encoding and Transmission Standard
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Illustrative Digital Library Services Diagram
Global Access Portal Material Type Portal [books] Material Type Portal [images] Material Type Portal [fossils] METS Content Management METS Content Management Preservation Repository Preservation Repository METS
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Content Management Systems
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Content Management Systems
Used to… Create and edit digital objects Import & export digital objects Manage objects (acquire, inventory, validate) Content Management Systems will Vary Depending on the Materials they Support Metadata schemes will vary Descriptive Metadata MARC/MODS/Dublin Core for Books Code books for numeric datasets Administrative Metadata Images, audio, test, etc.
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Content Format Standards (Images)
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Images- Content Format & Best Practices Identification/Provenance
Technical Imaging metadata Special discovery & descriptive metadata
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Best practices Use/Users/Collection: Benchmarking
Masters vs. Derivatives Scanning- Administrative Metadata- Structural Metadata-
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Scanning Best Practices
Think about users (and potential users), uses, and type of material/collection Scan at the highest quality that does not exceed the likely potential users/uses/material Do not let today’s delivery limitations influence your scanning file sizes; understand the difference between digital masters and derivative files used for delivery Many documents which appear to be bitonal actually are better represented with greyscale scans Include color bar and ruler in the scan Use objective measurements to determine scanner settings (do NOT attempt to make the image good on your particular monitor or use image processing to color correct) Don’t use lossy compression Store in a common (standardized) file format Capture as much metadata as is reasonably possiple (including metadata about the scanning process itself)
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Why Scale is important
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Identification/Provenance (Images)-
The number of variant forms of a work can be enormous Image Families A digital image frequently has many layers of parentage Information about the parentage that can indicate the quality and veracity of the image (Dublin Core "Source" and "Relation") how to deal with different versions derived from the same scan or different encoding schemes Vocabulary Standards to express this
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The number of variant forms of a work can be enormous
different views of the same object different scans of the same photo different resolutions different compression schemes different compression ratios different file storage formats different details of the same image ...
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Image Families
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Identification/Provenance
how to deal with different versions (browse, hi-res, medium res) derived from the same scan or different encoding schemes (TIFF, PICT, JFIF) Vocabulary Standards to express this VRA Surrogate Categories CIMI's "Image Elements”
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Incorporate parts of Functional Requirements for Bibliographic Records (FRBR)
work expression manifestion item (and push into “change history” section of Technical Image Metadata)
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NISO/DLF Technical Image Metadata Workshop--4/99 (Z39.87-2002 draft)
create metadata needed to manage images in digital repositories over long periods of time (full life-cycle mgmt) document image provenance & history ensure that the images will be rendered accurately on any output device
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Technical Image Metadata Focus on Metadata that may prove helpful for
management use preservation ...
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Technical Image Metadata In Scope
still, bit-mapped pictorial images scanned/reformatted images (+ born digital)
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Technical Image Metadata Out of Scope
vector images moving images images of OCR-able text structural and hierarchical relationships between images rights management, terms of use (authenticity/security)
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Technical Image Metadata Technical Image Metadata-Z39.87
Image parameters (MIME type, compression, colorspace & profile, …) Image Creation (source, capture info, etc.) Image performance assessment (sampling, colormap, whitepoint, target data, etc.) Change history (source, processing, etc.)
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Technical Image Metadata Technical Image Metadata-Z39.87
additional XML implementation schema (MIX)
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Other Metadata Description of depiction/surrogate (What VRA calls its "Surrogate Categories") Description of original object Rights and Reproduction Information Location Information VRA Core, LCSH, TGM, AAT, ULAN, TGN, DOI, <indecs>, ...
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Longevity & Preservation Repositories
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Digital Preservation-
The Problem Preservation Repositories Preservation Metadata Other Digital Preservation Activities Special concerns of Cult Heritage community
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Serious Longevity Problems
What we know from prior widespread digital file formats Previous formats required little ongoing intervention (remote storage facilities, Iron Mtn); digital formats require intense ongoing management The Short Life of Digital Info-
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The Short Life of Digital Info: Digital Longevity Problems
Disappearing Information The Viewing Problem The Scrambling Problem The Inter-relation Problem The Custodial Problem The Translation Problem
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The Viewing Problem Digital Info requires a whole infrastructure to view it Each piece of that infrastructure is changing at an incredibly rapid rate How can we ever hope to deal with all the permutations and combinations
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The Scrambling Problem Dangers from:
Compression to ease storage & delivery Container Architecture to enhance digital commerce
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The Inter-relation Problem
-Info is increasingly inter-related to other info -How do we make our own Info persist when it points to and integrates with Info owned by others? -What is the boundary of a set of information (or even of a digital object)?
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The Custodial Problem In the past, much of survival was due to redundancy How do we decide what to save? Who should save it? Mellon-funded E-Journal Archives How should they save it?-
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The Custodial Problem: How to save information?
Methods for later access Refreshing Migration Emulation Issues of authenticity and evidence
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The Translation Problem
Content translated into new delivery devices changes meaning -A photo vs. a painting -If Info is produced originally in digital form in one encoded format, will it be the same when translated into another format? Behaviors
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Older Longevity Projects http://sunsite.berkeley.edu/Longevity/
CPA Task Force Getty “Time & Bits” Conference & Follow-ups- Preservation experiments in US and Europe NEDLIB, CURL, Michigan Internet Archive Long Now
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Preservation Repositories: Projects based on OAIS Model
CEDARS NEDLIB Pandora CDL OCLC/RLG Working Group on Preservation Metadata, Attributes of a Trusted Digital Repository, August 2001-
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Preservation Metadata
OCLC/RLG Working Group on Preservation Metadata, Preservation Metadata for Digital Objects: A Review of the State of the Art, January OCLC/RLG Working Group on Preservation Metadata, A Recommendation for Content Information, October 2001
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Preservation Repositories: Open Archival Info System Model
OAIS Repository (Repository Administration) DIP Consumer SIP Producer AIP Management
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Preservation Repositories: Open Archival Info System Model
High-level reference model describing submission, organization and management, and continuing access Conceptual framework for different organizations to share discussions with a common language Producers, consumers, management, actual repository SIP, DIP, AIP AIP consists of data objects plus representation info (Content, Preservation Description, Packaging, Descriptive) Originally developed for Space Science community
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Preservation Repositories -- AIP Metadata
Preservation Description Info reference info context info provenance info fixity info Packaging Info Descriptive Info Content Info
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OCLC/RLG Digital Repository Attributes
Administrative responsibility Organizational viability Financial sustainability Technological suitability System security Procedural accountability
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OCLC/RLG Selected Recommendations
Policies, Certification processes, Risk management, Persistent ID, Migration/Emulation experiments Stakeholders meet to decide how to describe what is in a dig repository Examine special properties of particular classes of digital objects Technical standards for exchange and interoperability btwn repositories Develop projects and case studies Copyright issues
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Other Digital Preservation Activities-
LC Natl Dig Info Infrastructure & Preservation InterPARES Emulation Projects E-Journal Archiving ERPANET Persistent Naming
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LC’s National Digital Information Infrastructure and Preservation Program
Authorized Dec 2000 LC, Dept of Commerce, NARA, White House Office of Sci & Tech Policy with help from CLIR, NLM, NAL, OCLC, RLG Ongoing collab process Commissioned papers on preserving: the Web, periodicals, digital sound, E-Books, Digital TV, Digital Video
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InterPARES International Research on Permanent Authentication Records in Electronic Systems
Ongoing international archival world project examining how to make electronically-generated records last over time Developing the theoretical and methodological knowledge needed, then will formulate model policies, strategies, and standards In 2003 was extended to include images and rich media
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Emulation Projects CAMiLEON (Michigan/Leeds) NEDLIB
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E-Journal Archiving Issues Mellon funded projects (2001)
License, don’t own; may not be even able to obtain right to make archival copy Increasingly no paper back-up at all Usually we don’t have the important redundancy factor Mellon funded projects (2001) Yale, Harvard, Penn working w/individual publishers Cornell, NYPL--specific disciplines MIT exploring characteristics that change (dynamic)\ Stanford--archiving software tools
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Electronic Resource Preservation and Access NETwork (ERPANET)
Best practices and skills development for digital preservation of cultural heritage and scientific objects 3 year project launched Nov 2001; 1.2 million Euros
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Persistent Naming URNs Handles PURLs Re-directs
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Other Elements- Actors Metadata Other Metadata
Preserving Electronic Art
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Reference Models for Digital Libraries: Actors and Roles
DELOS/NSF Working Group Reference Models for Digital Libraries: Actors and Roles
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NSF/DELOS Actors/Roles Project
Classes of Actors, including Persons Organizations automata Roles & implications Production Dissemination Management use
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Multimedia & Collaborative Authorship imply
Not only: Authors Editors Publishers But also creators of Text Illustrations Composers Musicians...
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And goes beyond conventional authors
Others that are part of digital library process Users Catalogers Reference librarians Even other groups/entities Software agents Mediators Special rights holders...
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Borbinha’s “naive tentative sketch” of the problem...
User Registered Anonymous Librarian Agent Creator Editor Distributor Preservation Publication Licensing Acquisition Registration Dissemination Search Digital Library Access
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Benefits for Linking metadata to authority records Rights management
Privacy protection
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Deliverables Workshop proceedings: proceedings with invited contributions and papers selected from a call, intended to be a reference source for the current state of the art. White paper: Definition and introduction to the problem. Description and analysis of the requirements. A proposal to the community for a reference model, focusing on definitions of key concepts, terminology, classes of agents, services, relationships, etc. Proposals for an international agenda for further technical and collaborative developments.
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Core group DELOS (Europe)
José Borbinha, National Library of Portugal (DELOS coordinator) Michel Mabe, Elsevier Science, UK (Publishing industry) Peter Mutschke, Social Science Information Centre, Germany (Software agents, Information Retrieval) Hans-Jörg Lieder, Berlin State Library, Germany (LEAF project) Gunnar Karlsen, University of Bergen, Norway (Archives) WIPO – World Intellectual Property Organisation Glenn Macstravic NSF (USA) John Kunze, University of California, USA (NSF coordinator) Barbara Tillett, Library of Congress, USA (Libraries) Becky Dean, OCLC, USA (Libraries services) Angela Spinazze, CIMI/RLG, USA (Museums) Howard Besser, University of California, USA (Multimedia and digital art production) DCMI - Dublin Core Metadata Initiative Warwick Cathro, National Library of Australia
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Work plan Phase 1: Starting (March - April 2002)
Tuning objectives, scope, and action plan Identification of reference sources Call for contributions to the workshop Phase 2: Internal Discussion (May - June 2002) Analysis of the problem Draft paper Phase 3: Public Discussion (July - October 2002) Expose the draft paper. Promote open public discussion Workshop in Portugal (July 3-5). Workshop report Draft paper (second version) Phase 4: Conclusions (November - December 2002) Review of the work done... Final report
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... Actors and Roles ???
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Data Structures: The VRA Core
28 elements specifically for visual resource collections Work Description Categories- Visual Document Description Categories-
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VRA Core: Work Description Categories
Work type Title Measurements Material Technique Creator Role Date Repository name Repository place Repository number Current site Original site Style/period/group/movement Nationality/culture Subject Related work Relationship type Notes
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VRA Core: Visual Document Description Categories
Visual document type Visual document format Visual document measurements Visual document date Visual document owner Visual document owner number Visual document view description Visual document subject Visual document source
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Data Value Metadata (vocabularies)
LCSH TGM AAT ULAN TGN VRA Core
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LCSH very general
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Thesaurus for Graphic Materials
designed for subject indexing of pictorial materials, particularly large general collections of historical images for cataloging and retrieval good for general audiences and broad approaches to the material TGM-I: Subject Terms & TGM-II: Genre and Physical Characteristic Terms
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AAT 120,000 terms for describing objects, textual materials, images, architecture, and material culture from antiquity to present large and complex
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ULAN name authority
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Thesaurus of Geographic Names
over 1 million records hierarchical and global throughout history most records include coordinates and descriptive notes
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Metadata for Digital Commerce
DOI <indecs>-
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<Indecs> formal structure for describing and uniquely identifying intellectual property itself, the people and businesses involved in its trading, and the agreements which they make about it (primarily for publishing, music, and visual arts) will develop high-level specifications for the services that will be required to implement a global IP trading system based on this <indecs> generic data model focus is on encoding rights at a high level, not on resource discovery likely to involve metadata schma registration and directory to allow interoperation of personal identifiers for rightsholders and users supported by EEC DG-13 First meeting July 1999
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What’s special about Cult Heritage Materials?
Images & rich media Inter-relationships btwn parts For Contemporary Art: What is the Work?-
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LeWitt: Wall Drawing 340
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Installing LeWitt
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LeWitt Install Directions
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Complexity of Rich Media
Works often have artistic nature (including video games) Enormous number of elements can, at times, be very important to preserve (pacing, original artifact, elements used to construct the artifact) Too complex to save every one of these aspects for every type of material Importance of saving documentation
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What can we do specific to Electronic Art?
Works themselves may no longer even exist; in many cases, what we can save amounts to forensic evidence Enormous number of elements can, at times, be very important to preserve (pacing, original artifact, elements used to construct the artifact) Too complex to save every one of these aspects for every type of material Importance of saving pieces, representations, and documentation Involve the artists to capture their intentions Importance of Standards Familiarize ourselves with recent conservation developments (Who Knows?, TechArcheology, Tate, IMAP)
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Standards for encoding artists intentions (group efforts w/i Cult Heritage community)
Artists Interviews Project, Netherlands Institute for Cultural Heritage , Modern Art: Who Cares ( TechArcheology: A Symposium on Installation Preservation (SFMOMA) More recent SFMOMA/Tate collaborations IMAP Guggenheim’s Variable Media
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Structural Metadata Standards for Encoding Multimedia- (no time for details)
SMIL MPEG 4
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A few questions our community should address
Special issues raised by non-library institutions Special issues raised by images and rich media What is the work (or salient points we need to preserve)? Bring the arts communities (artist intent, BAVC) together with the preservation repository communities and the preservation metadata communities Specifically get Cult Heritage communities involved with the selected OCLC/RLG recommendations Get cult heritage groups started on working to make sure that structure standards incorporate our works What organizations will take responsibility to save today’s digital “ephemeral” materials (online ‘zines, arts discussion groups, etc.)?
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Digital Repository Traditions & Services require
Sustainability Interoperability Access And all of these require Standards and Metadata
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Building a Digital Future: Sustainable, Interoperable, Accessible Repositories
Howard Besser, NYU Archiving & Preservation Program Bernie Hurley, UC Berkeley Library Baca, Murtha (ed). Introduction to Metadata, Los Angeles: Getty Information Institute, 1998 METS official site: UC Libraries Systemwide Operations and Planning Advisory Group (SOPAG) Site for the UC Digital Preservation & Archiving Committee Final Report, the Access Integration Model white paper and the Library Services Privacy report
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