Н. С. Редькина The robust, standardized metadata generated strictly under the scheme make research findings discoverable and understandable for users and information retrieval systems. Acquiring high-quality metadata for open access scientific resources and their harmonization with schemes and standards enhance visibility and citation of research findings, retrieval performance, proliferation of research, cooperation, and thematic structures studies. The goal of this study is to identify the spectrum of metadata and metadata schemes as reflected in the open access resources (ROA). For this purpose, the following problems were solved: 1) the list of fields of metadata, schemes and standards was examined, 2) the key elements of metadata for publications indexed in the largest ROA (Google Scholar, OpenAlex, Dimensions and Lens, and in the Russian Resources RISC and Cobalt) were identified. The author concludes on the prospects for the discovery resources and scientific information processes and on the need to consider evolving functionality, increasing discoverability of metadata accuracy and completeness. Elimination of record ambiguity with identifiers and record standards, linking metadata in different resources, introduction of extra metadata field to assess research results and to classify in the ROA classification, will enable relevant information retrieval and re duce document management in various information retrieval systems.
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