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.)