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Jukka Aho
64056da96a
Major revision of ADR-002 based on implementation experience.
Decision change:
- OLD (Nov 9): Topology without node count (pure geometry)
- NEW (Nov 13): Topology with node count type parameter
Rationale:
Node count comes from MESH FILES, not from basis choice. When reading
Abaqus .inp, Code Aster .med, or GMSH .msh files, the mesh explicitly
specifies node count in element connectivity:
- Hex element (1,2,...,8) → 8 nodes
- Hex element (1,2,...,20) → 20 nodes
- Hex element (1,2,...,27) → 27 nodes
The mesh reader knows node count BEFORE basis functions are selected.
Therefore, topology must include node count: Hexahedron{N}.
New design:
struct Hexahedron{N} <: AbstractTopology end
const Hex8 = Hexahedron{8}
const Hex20 = Hexahedron{20}
This maintains type stability (N known at compile time) while
acknowledging that N originates from mesh data, not basis choice.
Supersedes: ADR-002 (November 9, 2025)