Аннотации:
Based on the analysis of typical scenarios of information
servers, the tasks that should be solved when organizing an access
control system for distributed information resources are formulated.
The possibilities of the Z39.50 technologies as the most suitable for
building such a system are considered. Within the framework of this
technology, three access control models are discussed, which differ
in the degree of integration of information server functions with the
Z39.50 technologies.
In this regard, the task of integrating information resources based on
the use of metadata to ensure the relationship between heterogeneous
sources of information and their effective use is the most urgent and
is being brought to the fore today.
The creation and support of distributed information systems and
digital libraries that integrate heterogeneous information resources
and operate in various software and hardware environments requires
special approaches to managing these systems. If the resources or
data themselves can be managed locally, even for distributed
information systems, then the task of managing access to distributed
resources cannot be solved within the framework of local
administration. The justification of the last thesis can be seen when
considering typical scenarios of the information server, which we
will describe later in this paper.
