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Auteur(s) : C. Weider
Classé sous : Names
RFC 1728 Resource Transponders December 1994
4) We need to make it easy for non-experts, such as librarians,
archivists, and database maintainers, to announce their new
resources to the various resource location services.
Many of these problems can be solved by a 'resource transponder'
3. Resource Transponders
The resource transponder system works by adding two new layers to
every resource: metainformation and an agent to update a resource
location system (RLS) with that metainformation. The metainformation
layer is physically attached to every resource, so that when the
resource is moved or altered, the metainformation is immediately
available to update the RLS. The agent layer may also be attached to
the resource or may not be; the implications of both of these options
are discussed in detail below.
The metainformation layer of a given resource contains any
information which might be required to create a pointer to this
resource, and any information which may be useful for indicating how
to catalog or index the resource. For example, the metainformation
layer of a text document might contain such things as the Uniform
Resource Name (URN) of the document (this is sort of a ISBN number
for electronic resources), the title of the document, a Uniform
Resource Locator (URL) for the document (this is a combination net
address and access method indicator, used for retrieval), the size of
the document, etc. Thus the metainformation layer contains data about
the resource to which it is attached.
This metainformation is expected to be modifiable. For example, the
metainformation layer may contain a history of where this particular
copy of a resource has been. Let's say that a resource/transponder
pair has been moved. When it gets to its new location, the agent can
then attempt to contact the resource at its old location to determine
whether the resource is still there (in which case the agent will
simply cause the new location to be added to the RLS) or whether the
resource is not there (in which case the agent can tell the RLS to
add the current pointer and delete the old one).
A number of other possibilities for the contents of the
metainformation level are contained in section 4.1.
Weider [Page 3]