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How to Build, Display and Find METS Objects

Explore technology, building, displaying digital objects, searching, tools, & future directions of METS objects. Delve into XML, METS Files, XSLT, MySQL & more.

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How to Build, Display and Find METS Objects

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  1. How to Build, Display and Find METS Objects Nate Trail Digital Project Coordinator Network Development and MARC Standards Office Library of Congress ALA - June 25, 2007

  2. Outline of Topics • A little about the technology • How we build and display digital objects • Searching • Other Tools • Future Directions • Conclusions

  3. Technologies Used • XML documents • METS Files • MODS Files • XSLT processes • Transformation • Display • MySQL Database • Cocoon framework • And a little Java

  4. XSLT Transformation MODS XML for Beaux Arts Trio recording Stylesheet “transforms” it into a simpler structure of elements, labels and values.

  5. XSLT for Display METS XML for Beaux Arts Trio recording XSLT “transforms” it into an HTML or XHTML display for the screen

  6. Web Framework Concepts • User input via URL • Create small programs for easy-to-modify parts • Separate Data from Action and Design

  7. Key Elements in Describing an Object • Bibliographic data • Files • Object type • (sheetMusic,printMaterial audio,video, compactDisc recordedEvent, bibRecord, photo, Article, Score…)

  8. Bibliographic data (1) • Harvested from Voyager ILS (SRU/z3950) • Inserted into MySQL database

  9. Direct Data entry for items not previously cataloged Bibliographic Data(2)

  10. METS Maker Pipeline – Step 1 • Bibliographic Data is extracted from the database and converted to MODS

  11. METS Maker Pipeline – Step 2 • Combine queries of: • Object type (SheetMusic, RecordedEvent etc.) • Files on the server • MODS data • Rights metadata • Creates a virtual file called “pre-mets” Object Type Files on Server WebPipeline pre- mets MODSMD RightsMD

  12. METS Maker Pipeline – Step 3 • METS Maker XSLT processes the file using the object’s profile and builds a METS File METS file for Beaux Arts Trio concert recording

  13. Display – Step 1 • Within-object Navigation

  14. Display – Step 2 • Descriptive information about the object

  15. Display – Step 3 • Page-turning or Playlists (pre-display virtual file )

  16. Display – Step 4 • Add page framing and breadcrumbs LC Presents header and high-level navigation Breadcrumb navigation LC Presents footer (not in view)

  17. Veterans History Project Displays Veterans History Project Experiencing War Header Standard Veterans History Project Header

  18. Searching • Lucene is open source and scalable to large indexes: Australia has 16 million items indexed • Lucene indexes are easy to configure using XSLT: METS  Indexed item

  19. Searching in LC Presents • Single box search offered on home page • Collection-level search offered for subcollections • Searches may also be limited to certain fields or object types

  20. Searching in LC Presents • Canned search to create “virtual collections”

  21. Searching in LC Presents Browse by Subject, Name or Title • New browsing capability

  22. Searching in Veterans History Limit by conflict, branch, gender, POW status, etc.

  23. Browsing in Veterans History Browse by last name, state, race/ ethnicity and war/branch

  24. Searching in Minerva (across collections) Choose among collections harvested. MODS terms to search.

  25. Other Web Tools • SQL – query any Oracle or MySQL tables from the browser • Holdings queries (beyond z3950/SRU) • Site administration • Convert from MARC to MODS or MODS to MARC • Convert HTML to XML • Link checking

  26. Future Directions • New Behaviors, Profiles • Article OCR • Multivolume Monograph • Generating RSS data on the fly • Integrate JHOVE file inspection tool (and MIX metadata) into our METS objects • Move to JPEG2000 file format for images

  27. Conclusions • Profiles in METS help define an object and it’s range of behaviors • METS and MODS play well together • The METS standard is flexible enough to describe multiple kinds of complex objects.

  28. Conclusions, cont. • MODS is extremely powerful as a structural tool, not just a bibliographic tool • Consistent, authoritative, structured metadata makes search and display for an object persistent into future software and hardware systems

  29. Conclusions, cont. • Standards matter. Without standardized structures, we can’t program a site to retrive or display items with any reliability. • Open Source software is a major step forward for the ability of libraries and other lower budget institutions to enhance the availability and use of their digital assets.

  30. Questions? Nate Trail ntra@loc.gov www.loc.gov/lcp (LC Presents Music, Theater, and Dance) www.loc.gov/vets (Veterans History Project) Library of Congress

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