Аннотация:Open government as a new system of public administration requires a qualitatively new level of information support for digital interactions of agencies, as well as between government and citizens, experts, and businesses. This article examines three categories of government counterparties, interactions with which are based on different principles: community of interest; subject areas; a loosely coupled environment. The public sector has now many information projects, and most of them deal with the data exchange, data delivery from and to the environment. The understanding of an environment is various for different projects. The categorization of projects depends on nature and the level of intellectual interaction with the external environment needed for the correct definition of project objectives, assessment of effectiveness. With the growing number of users and the transition to an open world, semantic principles are becoming more significant. Given the shift from systems integration to the semantic method, the role of subject matter expert is growing substantially.