The present elaborate of experimental thesis considers an actual reality that concerns, from few years, with the process of scientific communication: Open Archives and the OAI Initiative (Open Archive Initiatives).  The interest for such matter has sprung from the reading of an article, published on the News-bulletin of the SIMAI (Italian Society of Applied and Industrial Mathematics) by Dott.ssa Antonella De Robbio, Responsible of the library of the CAB (Center of athenaeum for libraries) besides the university of the Studies in Padua, in which some open problems were underlined related to the communication of the research results inside the academic scientific community.  Particularly this elaborate focuses the attention on the metadata and their importance for the realization of the scientific communication on which the OAI puts back its own efforts.  As it regards the metadata they come particularly deepened the Dublin Core format, adopted as base by the OAI, and the MARC 21 format, one of the few formats able to manage data highly formalized, as for instance those of the bibliographical catalogs.  Other treated aspect, regarding the metadata inside such initiative, it is their format XML of representation. Importance also is given to one of the active subjects in the process of communication among Open Archive: the Service Provider. The experimental part of the elaborate consists in the application of the software CDSware (Cern Document Server Software) for the conversion of the bibliographical records imported by the managerial system of library Aleph 500 in UNIMARC format to the XML MARC 21 format. Particularly, the realization of such part is focused on the use of the CDSware internal module: BibConvert, that allows the conversion of the bibliographical records withdrawn by an external source in the inside format of the CDSware system.