Bitstream Format Renovation DSpace Gets Real Technical Metadata
Bitstream. Format Renovation: DSpace Gets Real Technical Metadata
Bitstream. Format Renovation Prototype Benefits (Why Should I Care? ) • The new format identifier corrected or fixed unidentified data formats of 858 Bitstreams in DSpace@MIT. How many are mis-identified in your repository? • Accurate MIME-types improve delivery to Web clients • Quality preservation requires accurate data format knowledge • Interoperability with internal and external tools relies on correct technical metadata in commonly-recognized standards • Without automated tools, maintenance of format technical metadata is a tedious manual job for repository managers
Bitstream. Format Renovation Prototype Data Formats A “Data Format” is defined as: Technical Metadata that describes how abstract information is encoded and structured in a digital document. “Abstract Information” refers to the actual intellectual content contained in the digital object.
Bitstream. Format Renovation Prototype Problems with Current Format Technical Metadata • Formats are identified with arbitrary names; that hinders interoperability • No means to collect additional format technical metadata, e. g. format specification documents. • Identifying formats only by filename extension is imprecise and unreliable • Current internal format model is inflexible
Bitstream. Format Renovation Prototype Terms • Format Registry – PRONOM – GDFR • Identification Plugins – DROID – JHOVE • Interoperable Format Identifiers – MIME Type – PUID (PRONOM Unique IDentifier)
Bitstream. Format Renovation Prototype Object-Model Architecture Connected to PRONOM
Bitstream. Format Renovation Prototype Identification of Two Bitstream. Format Types
Bitstream. Format Renovation Prototype The Local “DSpace” and Provisional Registries
Bitstream. Format Renovation Prototype Interface to External Registries • Get Synonyms – Returns a list of identifiers that are bound to the same format record • Import – Turns an external format description into a new Bitstream. Format entry, initializing its metadata fields from the external registry • Update – Refresh the metadata fields of a Bitstream. Format to keep up with changes • Conforms. To – Tests whether the format described by one identifier “conforms to” or is a sub-type of another format
Bitstream. Format Renovation Prototype The Bitstream Format Metadata Admin Panel
Bitstream. Format Renovation Prototype Importing New Bitstream Formats
Bitstream. Format Renovation Prototype Editing Bitstream. Format Metadata
Bitstream. Format Renovation Prototype Digital Preservation Strategies • Pluggable architecture allows for access to external identification and technical metadata tools • Access and preservation rely on accurate format identification • Migration / Obsolescence tools are only effective with correct and precise identification, because format versions matter • The creation of derivatives (i. e. thumbnails or delivery versions) via Media. Filter will also rely on accurate identification
Bitstream. Format Renovation Prototype Interoperability Benefits • Avoids platform lock-in • Reliable delivery functionality • Consistent object description semantics (ORE) • Interoperability with digital preservation services
Bitstream. Format Renovation Prototype Quantitative Results DSpace@MIT (155, 000 Bitstreams) • Before: – 1, 020 Unidentified (0. 65%) • After: – 162 Unidentified (0. 104%)
Bitstream. Format Renovation Prototype Related Links http: //wiki. dspace. org/index. php/Bitstream. Format_Renovation http: //www. nationalarchives. gov. uk/PRONOM/ http: //droid. sourceforge. net/wiki/index. php/Introduction https: //collaborate. oclc. org/wiki/gdfr/about. html http: //www. loc. gov/standards/premis/ http: //pilot. apsr. edu. au/wiki/index. php/AONS_II http: //www. ijdc. net/ijdc/article/view/53/ http: //hul. harvard. edu/jhove/ http: //web. mit. edu/sands/www/bfr
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