Thursday, August 02, 2012

OAIS 2012 update.

OAIS 2012 update. Barbara Sierman. juli 30, 2012.
Reference Model for an Open Archival Information System (OAIS). Magenta Book. Issue 2. June 2012. 

The main changes are the following:
·         Access Rights information is added as an element to the Preservation Description Information.
·         emulation as a strategy to preserve access services or the original look and feel and explains how different varieties of emulation will fit in the OAIS model.
·         There is more interaction between the Administration Functional Entity and the Preservation Planning Functional Entity. The Preservation Planning Functional entity will create preservation plans (and not only “migration plans” as mentioned in the previous version), based on its monitoring activity,  and will send these to the Administration functional entity to be performed. But the Administration Functional Entity (cq.  the function The Establish Standards and Policies) will also receive periodic risk analyses created by Preservation Planning to act upon, which gives the Preservation Planning Functional Entity a more active role in monitoring not only the outside world but also the OAIS itself.  Interaction also takes place when Preservation Planning sends recommendations on AIP updates, and The Administration Functional Entity replies with preservation requirements (added to the already exisiting “migration goals and approved standards”). So for creating new migration packages not only the preservation requirements resulting from monitoring the Designated Community are input, but also the preservation requirements from Administration. In general some loose ends seems to be united here.
·         The confusing use of the word “authentication” has now changed and the term “authenticity” is defined (adding the much used definition of “The degree to which a person (or system) regards an object as what it is purported to be.” With an important addition: “ Authenticity is judged on the basis of evidence.”
·         The term Information Package is redefined to : “ A logical container composed of optional Content Information and optional associated Preservation Description Information. Associated with this Information Package is Packaging Information used to delimit and identify the Content Information and Package Description information used to facilitate searches for the Content Information.”
·         A new definition is introduced “Other Representation Information” and described as “Representation Information which cannot easily be classified as Semantic or Structural. For example software, algorithms, encryption, written instructions and many other things may be needed to understand the Content Data Object, all of which therefore would be, by definition, Representation Information, yet would not obviously be either Structure or Semantics. Information defining how the Structure and the Semantic Information relate to each other, or software needed to process a database file would also be regarded as Other Representation Information.”
·         This chapter is adapted with the above mentioned changes and refines the definitions for an AIP version (An AIP whose Content Information or Preservation Description Information has undergone a Transformation on a source AIP and is a candidate to replace the source AIP. An AIP version is considered to be the result of a Digital Migration.) versus an AIP edition (An AIP whose Content Information or Preservation Description Information has been upgraded or improved with the intent not to preserve information, but to increase or improve it. An AIP edition is not considered to be the result of a Migration.)

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