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Summary and background

The use of linked data within a traditional library catalog is the key to broader implementation of linked data within the academic library community. Without a concrete demonstration of the benefits of linked data, administrators are reluctant to commit the time, effort, and funds for the transition from MARC. LD4P2 will enhance the Blacklight open source search engine with linked data features, such as (1) knowledge panel in search results to present contextual information powered by linked data; (2) browsing based on authority files and links to related entities in external data; (3) semantic search, which could include laying out alternative terms in a “no results” page, suggesting semantically related terms in a type-ahead, or providing richer, geo-based browse by leveraging URIs for places; and (4) microdata on item pages to enable machine crawling.

 More about WP4 from the grant proposal...

Blacklight has hundreds of installations worldwide and particularly deep adoption in North American research libraries, and in conversations at ALA Midwinter 2018 about the next phase of LD4P, Blacklight discovery captured the imaginations of a number of libraries.

Potential discovery enhancements to Blacklight include (1) knowledge panel in search; (2) browsing based on authority files and links to related entities in external data; (3) semantic search; and (4) microdata on item pages to enable machine crawling.

Items 1 (knowledge panel in search results to present contextual information powered by linked data) and 4 (microdata) have proven implementations in other discovery environments, and will be the first targets for development.

Item 2 (browse) offers the richest potential benefits to users. This effort will require balancing the capabilities of the data, user needs, design of an intuitive and useful interface, and technical constraints of current technologies. Challenges and questions around designing and implementing an effective browse experience include:

  • Is it viable to integrate a network graph powered by semantically enriched library metadata? Would such a tool prove useful and intuitive to library users in a general purpose discovery environment?
  • How can concatenated, LCSH subject headings best be represented in a browse interface? Is it possible to break them into discrete elements (such as with FAST) and enable toggling on and off discrete elements? If so, will it be intuitive?
  • For geographic browse, what kinds of visualizations will allow for users to navigate for works about or by creators in certain areas? Will points-on-maps provide enough / useful visualization, or will regions be needed (and more useful)? How will we cluster or show density of terms—via a cluster of pins or perhaps a heatmap?
  • Can we implement a NetFlix or Amazon-style browse that will meet patron needs and expectations for scholarly browse, and also be based on the catalog data we have?
  • Does the growth in use of mobile device users of the catalog change anything we might do for browse user interfaces?

Item 3 (semantic search) also has promise, though the best examples of semantic search happen in more tightly scoped information domains (such as medical search using MeSH). Analysis and experimentation will be required to see if subject searches and headings will lend themselves to a semantic approach in a general catalog environment. We intend to explore geographic search as a first and promising entry point to this approach. Analysis will include how patrons interact with the library catalog, especially for subject searches and searches resulting in zero results, to create a better, user-centered design; log analysis of current searches, as well as data analysis to determine what search arguments could be transformed to alternative searches with richer results using linked data. It will also include exploring technical approaches to semantic search, including adding semantically-related terms at index time, leveraging dynamic look-ups of linked terms via external services, and performant approaches to including semantic type-ahead / autosuggest of search terms.

This analysis and experimentation will be done by a team combining user experience designers, metadata experts, and software engineers. Design and development will happen in an iterative manner as the group explores objectives and possible approaches; trials implementation; assesses effectiveness; and refines for better results.

Development of the Blacklight enhancements will be supported by the developers, UX designers and technical services at Cornell and Stanford. The development of semantic search and browse mechanisms, including visualizations where useful, will be supported by the Iowa team.

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