The organization of educational information through innovative computing technology allows to move away from the linear organization of the learning space, thereby creating its "volumetric" analogue. In the modern view one of the effective means for the structural and logical construction of electronic educational resources as rather complex knowledge systems is ontology.Ontology is an attempt at a comprehensive and detailed formalization of a field of knowledge using a conceptual schema which usually consists of a data structure containing all relevant classes of objects, their relationships and rules (theorems, constraints) adopted in a particular subject area. In world practice, for the clarity of ontologies, ontological graphs (ontographs) are used.The presentation of information in the form of an ontograph makes it possible to display not only a single term (concept), but also to obtain all its semantic relationships with other concepts and categories, thereby comprehending its role in a given knowledge system or in solving a problem, showing the semantic effect of structural and logical organization of term fields.The goal of this study is to summarize the results of our research, emphasizing the feasibility of ontological modeling of electronic educational resources (textbooks, manuals, simulators, etc.) using ontographs.Indeed, the ontology O is a fixed logical construction of the form O = , where X, R, F are finite sets, respectively, of terms (concepts), connections between them and functions that determine their interaction.Since the set is finite, there is a certain superset that either coincides or contains the specified set of concepts and is described by a certain set of rules (laws, criteria). It is usually called a subject area. Thus, each separately taken electronic educational resource can be represented as a set of certain concepts of varying degrees of detail, between which links of a different nature are established. The paper presents the modeling of electronic educational resources as sets described by ontological graphs.