Information Technology Reference
In-Depth Information
To complete the picture we can then see a way to define the Designated
Community, namely we define them by what they know, by what OAIS terms their
Knowledge Base:
Knowledge Base:
A set of information, incorporated by a person or system that
allows that person or system to understand received information.
All these terms will be discussed at much greater length in
Chap. 6
.
3.2.2 Origins, Context and Restrictions (Preservation Description
Information)
OAIS defines a group of types of “metadata
”
, under the name of Preservation
Description Information (PDI), which are to do, broadly, with knowing what and
where the digital object came from.
The idea is that one needs to name a way to identify the digital object; to know
how and by whom and why the digital object is what it is; to know the broader
context within which it exists; to be sure that the digital object has not been changed
and finally, to know what rights are attached to it (see Fig.
3.4
).
The following sections provide the OAIS definitions with a little additional
explanation; further details are provided in
Chap. 10
.
3.2.2.1 Reference Information
Reference Information:
The information that is used as an identifier for the
Content Information. It also includes identifiers that allow outside systems to refer
unambiguously to a particular Content Information
. An example of Reference
Information is an ISBN. Clearly what are often called persistent identifiers, which
we discuss further in
Sect. 10.3.2
, provide a form of Reference Information.
Preservation
Description
Information
Reference
Information
Provenance
Information
Context
Information
Fixity
Information
Access Rights
Information
Fig. 3.4
Preservation description information
