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PREMIS and the National Digital Newspaper Program

PREMIS and the National Digital Newspaper Program. Justin Littman Office of Strategic Initiatives, LC jlit@loc.gov. Overview. Repository of digitized, historical newspapers Implemented PREMIS in 2005 To date, applied to ~1.2 million digital objects. What we do.

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PREMIS and the National Digital Newspaper Program

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  1. PREMIS and the National Digital Newspaper Program Justin Littman Office of Strategic Initiatives, LC jlit@loc.gov

  2. Overview • Repository of digitized, historical newspapers • Implemented PREMIS in 2005 • To date, applied to ~1.2 million digital objects

  3. What we do • PREMIS metadata for each file • TIFF • PDF • JP2 • ALTO • METS (subset of metadata) • PREMIS metadata is included as <techMD> in METS

  4. What we do - example <!--PREMIS technical metadata for digital master for page 1--> <techMD ID="masterPremis1"> <mdWrap MDTYPE="OTHER" OTHERMDTYPE="PREMIS" LABEL="PREMIS object metadata"> <xmlData> <premis:object> <premis:objectCharacteristics> <premis:fixity> <premis:messageDigestAlgorithm>SHA-1</premis:messageDigestAlgorithm> <premis:messageDigest><!--SHA-1 checksum (Required)--> </premis:messageDigest> <premis:messageDigestOriginator>Library of Congress</premis:messageDigestOriginator> </premis:fixity> <premis:size>1</premis:size><!--Size of the file in bytes.(Required)--> <premis:format> <premis:formatDesignation> <premis:formatName>image/tiff</premis:formatName> </premis:formatDesignation> </premis:format>

  5. What we do – example, continued <premis:significantProperties> <ndnp:exemptionSet> <ndnp:code>TEST1</ndnp:code> <ndnp:code>TEST2</ndnp:code> </ndnp:exemptionSet> </premis:significantProperties> </premis:objectCharacteristics> <premis:creatingApplication> <premis:creatingApplicationName><!--creatingApplicationName (optional)--></premis:creatingApplicationName> <premis:creatingApplicationVersion><!--creatingApplicationVersion (optional)--></premis:creatingApplicationVersion> <premis:dateCreatedByApplication>2004-11-22T00:00:00</premis:dateCreatedByApplication><!--dateCreatedByApplication (required for master)--> </premis:creatingApplication> </premis:object> </xmlData> </mdWrap> </techMD>

  6. What we do - related • MIX metadata for each image file • Enveloped XML digital signature for METS file • Modified PREMIS schema to omit some mandatory elements: • <objectIdentifier> • <objectCategory>

  7. How we do it • PREMIS is generated and inserted into METS by NDNP Validation Library • PREMIS is created by an XSLT transformation of representation information produced by JHOVE

  8. Lessons learned • Would prefer PREMIS schema to be more modular • Shift in (personal) philosophy: For technical/preservation metadata, less is more: • Collect metadata for immediate needs • Can’t guess what will be needed in the future • If metadata can be derived, then derive when necessary

  9. Lessons learned, continued • PREMIS as reference model rather than implementation model • Fixities stored in METS/PREMIS require custom tools to verify • Simpler approaches / common utilities more interoperable

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