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Content Access Characterization in Digital Libraries

Content Access Characterization in Digital Libraries. Greg Janée • James Frew • David Valentine University of California, Santa Barbara. Motivation. Provide meaningful, useful access to geospatial resources Geospatial resources are... complex assemblages of components large

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Content Access Characterization in Digital Libraries

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  1. Content Access Characterizationin Digital Libraries Greg Janée • James Frew • David Valentine University of California, Santa Barbara

  2. Motivation • Provide meaningful, useful access to geospatial resources • Geospatial resources are... • complex assemblages of components • large • accessible in various modes • often offer service-based access • Close ties to data analysis environments • e.g., GIS

  3. Context identifier DL resource bucket view browse view access view others...

  4. Related work • Content standards • Dublin Core: URLs • FGDC: multiple “distributions” • METS • powerful, but complex • doesn’t make key distinctions

  5. ADL access framework • “Access point” • a single, independently accessible representation of the resource or subcomponent of the resource • four types • Hierarchy mechanisms • Decomposition (multipart) • Alternatives • multiple equivalent formats • individual components vs. single aggregate • NB: hierarchy mechanisms nest

  6. Types of access points • Download • URL; format, MIME type, encodings, size • Service • URL; protocol, definition • Web interface • URL • Offline • reference or citation

  7. Example • U.S. Geological Survey “Digital Raster Graphic”(scanned topographic map) • multiple components (files) • image • georeferencing data • multiple access options • download TIFF • access via MrSID (hierarchical multiresolution) • multiple offline locations • depository libraries

  8. Conclusion • Simple access framework • 4 types of “access points” • 2 hierarchy mechanisms: alternatives, decomposition • Captures key distinctions important to programmatic clients • Outstanding issues • integration with access control mechanisms • role of conversion services

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