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Annotations and virtual collections
The first two use cases address user tagging and the ability of librarians or others to curate potentially very large collections of library resources through annotations external but linked to the bibliographic metadata. Existing ontologies were identified that support annotations and the assembly and ordering of individual resources into collections.
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Expressing bibliographic metadata to support discovery
The LD4L use cases Use Cases largely target specific ways to supplement traditional library catalog metadata, whether through linkages to external identities and resources, connecting catalog records with other digital collections, or adding usage metrics , or and annotations. Some go on to use cases suggest new functionality by leveraging this new "library graph" in services that go beyond direct, text-based matching of search terms to suggest deeper connections and even loop back from externally linked entities to additional local resources or related resources in other libraries.
In parallel with enriching query results for users through additional linkingthese efforts, the LD4L project is also looking to better align bibliographic metadata with seeks to more reliably populate facets such as genre, format, uniform title, subject, and online availability to meet user expectations. Where indexing for library resources. Indexing MARC metadata for search now typically requires complex case statements reflecting variations in local cataloging practice by discipline or over time, we and resources from other digital collections may not even include the appropriate information. We see conversion to RDF using ontologies as an opportunity to use ontologies to capture important express these and other user-facing facet values explicitly, thereby reducing reliance on 'black box' processing and increasing the interoperability of metadata and re-usability of tools across libraries despite historical differences in local cataloging practice.
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