Development of queries using the Z39.50 protocol in distributed information systems to support scientific and educational activities

Abstract

Distributed information systems that support scientific and educational activities can work with various information systems. The main goal of creating a distributed information system supporting scientific and educational activities is to accelerate the pace and improve the quality of information exchange in the scientific environment. The paper considers technological methods for constructing models of information systems designed to support scientific and educational activities. The model under consideration is that the developed model of an information system for working with scientific materials should solve the problems of long-term storage of information, organizing data search by attributes, accumulating and replacing metadata. 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. 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. The creation and support of distributed information systems and electronic libraries that integrate heterogeneous information resources and operate in various software and hardware environments require 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 below

A Model of a Distributed Information System Based on the Z39.50 Protocol

“…6. Visualization of information from distributed (heterogeneous) sources in unified user interfaces [13]. Distributed information systems represent an increasingly important trend for computer users.…”

“…System metadata. Provide technological tasks of the resource management system, for example, contain rules for providing documents to the user, rules for converting data schemas of structural metadata, rules for determining associative relationships between documents, etc [13].…”

“…The following attribute sets are currently standardized in the {Z39.50 3} class: Variant set definitions Z. 13 database schema definitions Z.14 tag set definitions Z.15 negotiation definitions Z. 16 query definitions Within each class, objects are assigned an identifier, the prefix of which contains the OID of the class.…”