Technical Aspects
The Digital Library of Slovenia portal acquires publications metadata directly by using Z39.50 protocol which provides access to a library catalogue, or the information is a result of a digitisation of materials. Basis for metadata description is the Dublin Core (DC) standard which suggests enlistment of 15 basic elements for describing digital objects that may be extended at will by using expandable DC scheme.
Data are taken through the HTTP protocol by placing demand on OAI-PMH server that enables influx and transmission of data from practically all existing metadata schemes. Server provides a result in one of the XML format, defined in advance. As data collections can be huge, because transferred through the web, and formation and transfer of huge XML files might take too long, transfer of collection is split in optional number of series.
National libraries, archives, depositary units and other owners of electronic contents who receive data are often faced with question referring to permanent tracking of published electronic documents. Accessibility of articles (as for instance as basis of reference) should be ensured irrespective of the fact that Uniform Resource Identifier (URI) of a document can be changed (even often). One of the most prevalent international approaches enabling tracking of digital contents irrespective of variability of their web location is use of DOI (Digital Object Identifier) service. Another solution that can be implemented on local level is called Uniform Resource Name (URN).
While Digital Object Identifier is administered by the International DOI Foundation (IDF) organisation and the usage of a DOI identifier is a payable service, the URN is a solution that can be developed and used free of charge. National and University Library provided realisation of the Digital Library of Slovenia. Principle of the operation and usage of a URN reference number to a great extent resembles to the DOI indicator.There are two major system functions: the URN generator – service defining unique URN record for every object and the URN resolver – interpreter that connects a given URN record with a digital object.
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