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VIRTUAL COLLECTIONS Focus on Metadata

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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VIRTUAL COLLECTIONS Focus on Metadata

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  1. Cataloging Discussion Group , Friday, November 18 VIRTUAL COLLECTIONSFocus on Metadata

  2. 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

  3. 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.

  4. 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)

  5. 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

  6. 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

  7. Harvesting: Transformations(Crosswalks/XSL) • HOLLIS • MARC21 (xml)-> xsl -> MODS (xml) • VIA • VIA (xml) - xsl -> MODS(xml) • HGL • FGDC (xml) -> MARC21 (xml) -> MODS (xml)

  8. MODS Metadata Standard • Metadata Object Description Schema • MODS Top Level Elements • MODS Schema • MARC to MODS Crosswalk • MARCXML to MODS XSL stylesheet

  9. 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 *

  10. Demo of Prototype • Bicycle Virtual Collection • Contains records from • HOLLIS • VIA • HGL 002223743 olvwork93048 local olvwork125041 MGISRAILTRA1

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