This paper presents Omps, a new timeline-based software architecture for planning and scheduling whose features support software development for space mission planning applications. The architecture is based on the notions of domain components entities whose properties may vary in time and which model one or more physical subsystems which are relevant to a given planning context. Decisions can be taken on components, and constraints among decisions modify the components' behaviors in time. This paper presents the general features of Omps and an example of how the architecture support development of complex applications.
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