Traditional library systems

• Organizational systems for indexing and locating resources
• Inventory back end, with a catalogue front end
• Typically built with MAchine Readable Cataloguing (MARC) as the metadata container

Libraries as early technology adopters

• Telnet access to catalogues
• Z39.50 protocol for sharing records
• SIP protocol for circulation transactions
• OpenURL protocol for resolving article requests
• COinS microformat for embedding citations in HTML
• unAPI for offering different metadata representations

Themes

• Mission: to satisfy a broad range of user queries
• Machine-readable metadata
• Culture of sharing and openness
• Technology adoption and innovation
• ...
• So traditional library systems are all over the Semantic Web, right?

No.

Libraries at an impasse

Boutique innovation

the use of HTML5 Microdata and schema.org by Google, Bing and Yahoo, and the use of RDFa by Facebook are [...] good reminders that the library software development community is best served by paying attention to mainstream solutions, as they become available, even if they eclipse homegrown stopgap solutions

Summers (2011)
GoodReads microdata

Proprietary library software

• Vendors are generally unmotivated to invest in enhancements
• Barriers to customizing for customers:
  • Non-persistent URIs(!)
  • Restricted (or non-existent!) APIs or raw data access
  • Non-standard templating systems
  • Walled garden for customizations
  • Lack of skilled resources to apply to the problem

Library adoption of schema.org (2012)

• Ronallo (2013) analyzed American academic libraries' presence in the 2012 Common Crawl
• Results: fewer than 10,000 schema.org instances across American academic libraries

Open source library systems

• Native to the web: persistent URIs!
• Rapid, iterative community development
• Built on standard components == transferrable knowledge for contributors

Proof of concept: target implementations

Multiple systems to ensure general applicability of approach

• Koha
  • GPL since 1999
  • 2,500 - 8,000 live instances
• Evergreen
  • GPL since 2006
  • ~1,250 live instances
• VuFind
  • GPL since 2007
  • ~150 live instances
• 10,000 - 1,000,000 records per instance

schema.org vocabulary development

• W3C WebSchemas group
• W3C Schema.org Bibliographic Extension community group (SchemaBibEx)
  • Open source library systems as reference implementation

Approach

1. Map MARC21 record types to schema.org types
2. Map MARC21 record elements to schema.org properties
3. Link resources to the described object
4. Describe libraries themselves with linked data

1. Map MARC types to schema.org types

• Highest confidence in schema:Book, schema:Map, schema:MusicAlbum
• Fallback to schema:CreativeWork

• Note: Complexity and over-generalization of MARC21 hampers mapping efforts
• ... is a "Projected medium - Videorecording - Electronic" a schema:Movie or schema:TVSeries?

2. Map MARC21 record elements to schema.org properties

• Respect schema range and embedded entities (schema:Person for schema:author rather than just literals)
• Focus on schema:CreativeWork properties, as more specific types inherit without adding many properties
• Implementation: XPath against an XML serialization of MARC, with regular expressions where necessary

3. Link resources to the described object

• Adopt the GoodRelations agent-promise-object model

4. Describe libraries themselves with linked data

• Use schema:Library to supply address, operating hours, contact information
• Note: Currently only implemented by Evergreen

Library structured data

[] a schema:Library ;
    schema:address _:N636dfc60d58348a6abfe137cedde470a ;
    schema:branchOf <http://example.org/library/AMESBURY> ;
    schema:location _:N636dfc60d58348a6abfe137cedde470a ;
    schema:name "Example Public Library"@en-us ;
    schema:openingHoursSpecification [ a schema:OpeningHoursSpecification ;
            schema:closes "8:00 PM"@en-us ;
            schema:dayOfWeek <http://purl.org/goodrelations/v1#Monday> ;
            schema:opens "10:00 AM"@en-us ], ... ;
    schema:telephone <tel:555-555-5555> ;
    schema:url <http://example.org/> .

_:N636dfc60d58348a6abfe137cedde470a a schema:PostalAddress ;
    schema:addressCountry "US"@en-us ;
    schema:addressLocality "Example"@en-us ;
    schema:addressRegion "MA"@en-us ;
    schema:contactType "Mailing address"@en-us ;
    schema:postalCode "90210"@en-us ;
    schema:streetAddress "149 Main St."@en-us .