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Cataloging Discussion Group , Friday, November 18. VIRTUAL COLLECTIONS Focus on Metadata. What is “Virtual Collections”. OIS System to allow librarians / curators to harvest metadata from various Harvard online catalogs and create a new, topic-based collections.

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Cataloging discussion group friday november 18

Cataloging Discussion Group , Friday, November 18


What is virtual collections
What is “Virtual Collections”

  • OIS System to allow librarians / curators to harvest metadata from various Harvard online catalogs and create a new, topic-based collections.

  • Web-based interface for collection-level search and display of metadata, with links to digital objects.

  • A Virtual Collection constists of metadata only; records link to external digital objects

Major aspects of virtual collections
Major Aspects of Virtual Collections

  • Harvesting: Initially supporting harvesting from HOLLIS, VIA and HGL

  • No additional cataloging necessary in source catalogs (HOLLIS, VIA, HGL)

  • Local Subject Vocabulary: Curator can create a controlled list of subject terms, distinct from any subjects in the harvested records.

  • Customization: Collection can customize appearance of the Web display with XSL and CSS stylesheets.

Metadata focus
Metadata Focus

  • Harvesting of Metadata from HOLLIS, VIA, HGL

  • Transformation of Metadata from original form to final Virtual Collection form (MODS)

  • What the metadata looks like displayed in a Virtual Collection (aka Demo)

Harvesting ois harvester
Harvesting: OIS Harvester

  • OIS Harvesting software

    • reads “harvest file” of system/id pairs

      • HOLLIS 002223743

      • VIA olvwork125041


    • file can be initialized from an Aleph report for HOLLIS, and the Portfolio function of VIA.

    • Harvester requests records from catalogs, transforms and loads into Virt. Coll. database

Harvesting oai pmh
Harvesting: OAI-PMH

  • Open Archives Initiative Protocol for Metadata Harvesting (OAI-PMH )

  • OAI Harvester -> http request -> OAI DataProvider

  • OAI DataProvider -> xml record -> OAI Harvester

  • HOLLIS: Data Provider from ExLibris

  • VIA: OIS Custom Data Provider

  • HGL: OIS Custom Data Provider

Harvesting transformations crosswalks xsl
Harvesting: Transformations(Crosswalks/XSL)


    • MARC21 (xml)-> xsl -> MODS (xml)

  • VIA

    • VIA (xml) - xsl -> MODS(xml)

  • HGL

    • FGDC (xml) -> MARC21 (xml) -> MODS (xml)

Mods metadata standard
MODS Metadata Standard

  • Metadata Object Description Schema

  • MODS Top Level Elements

  • MODS Schema

  • MARC to MODS Crosswalk

  • MARCXML to MODS XSL stylesheet

Why mods for virtual collections
Why MODS for Virtual Collections?

  • Richer metadata than Dublin Core

  • Clean mapping from MARC to MODS

  • Supports hierarchical VIA records

    • relatedItem element

  • Virtual Collections Schema

    • One primary schema for all collections

    • Local Subject schema for each collection *

Demo of prototype
Demo of Prototype

  • Bicycle Virtual Collection

    • Contains records from

      • HOLLIS

      • VIA

      • HGL


        olvwork93048 local