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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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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
      • HGL MGISRAILTRA1
    • 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)
  • HOLLIS
    • 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

002223743

olvwork93048 local

olvwork125041

MGISRAILTRA1

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