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When migrating its database to a new server, MOKKA considered to perform a few data corrections and apply some procedural enhancements. The modifications fall into four major categories. 1. The integrity and scope of data were improved: besides some minor changes regarding the coded information of the records, the data of MOKKA was subjected to a new duplicate check mechanism and some special fields that add further information to the basic bibliographic description (table of contents data, item specific information such as provenance statements etc.) were paid a more serious attention. 2. Some of the previous processes of checking the quality of incoming data and those of handling volume information were changed to suit the workings of the member databases better. 3. Authority records, both name and subject authorities, created in member libraries were loaded into the MOKKA database to better the authority control and add further search possibilities to the database. At the same time preparations were made to accept new or updated authority records from the member libraries on a daily basis. 4. Some changes to the indexing of the database were also administered to widen the scope of available search options, making it possible to perform a very broad search against all important bibliographic fields on the one hand, and against some very specialised ones (possessors, binding).
The article discusses the possibilities and gives examples of using MARC records with related URLs as a method of organising a library's electronic collection. The MARC records may be very simple, providing only the few most important access points, or may contain many names, geographical names and other subject entries to the electronic document they are describing, thus creating a sophisticated search tool even to electronic libraries stored in picture files. The MARC records may become part of the library's general catalogue or may form a separate database. In the latter case it is possible to create special indexes according to the needs of the material in the electronic collection. Trying to make use of the potentials of detailed MARC coding may spare us the effort of converting our picture files into xml coded text.
The Hungarian National Shared Catalogue (MOKKA) is a database with three major tasks to fulfil. When it was launched its main mission was to provide a common pool of authentic bibliographic records for libraries to share. Since then, it has also become a valuable online tool for the general public when they try to locate books, audiovisual material, printed music and other online documents in Hungarian libraries. It contains the catalogue records of the Hungarian Electronic Library as well. Thirdly, as a result of a development to be implemented in the near future, MOKKA will become the bibliographic foundation of the National Document Delivery System replacing its present bibliographic database. This article summarizes how the relatively simple functional model of the database is supplemented with a duplicate check and conversion processes of data format, character sets, and often library specific transformations of local conventions to ensure a more or less coherent database. Another aim of the paper is to enhance the co-operation between the databases of MOKKA and its 31 contributing libraries by pinpointing the elements of submitted records that are especially important for the workings of the central mechanism and thus for the quality of the MOKKA database.
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