The work is a development of research conducted by the authors in the field of creating a Common Digital Space of Scientific Knowledge (CDSSK). In the framework of previous studies, a unified structure for representing the ontology of the elements of the CDSSK (subspaces, classes and attributes of objects, relationships between objects or attributes) was proposed. This paper presents a variant of the ontology of the universal subspace (AXES) of the CDSSK, proposed by the authors, built in accordance with the developed structure. There are defined 10 subject and 10 auxiliary classes of objects In the described model of USS. Among the subject classes are “persons”, “publications”, “museum objects”, “events”, etc. Among the auxiliary ones are “formats”, “units of measurement”, “languages”, etc. The paper contains reference book of each class, is built in accordance with the ontology structure model, a list of object attributes, their directories and examples of static dictionaries.