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Capstone is a geometry-centric platform for a unified representation of the geometry, mesh and attribution needed for engineering analyses with varying fidelity. Meshes and the attributes are both associated with a robust mathematical model of the geometry enabling any change in the geometry to be automatically propagated to the meshes and attributes needed for analyses. It provides a software platform with well abstracted and compact interfaces to create, modify and query geometry, mesh and attribution information for a model. This forms a foundation for geometry-based design environments and solvers that access geometry at runtime for scalable and accurate a-posteriori mesh adaptation.