PREMIS and the National Digital Newspaper Program Justin Littman Office of Strategic Initiatives, LC

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

What we do PREMIS metadata for each file  TIFF  PDF  JP2  ALTO  METS (subset of metadata) PREMIS metadata is included as in METS

What we do - example SHA-1 Library of Congress 1 image/tiff

What we do – example, continued TEST1 TEST T00:00:00

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: 

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

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

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