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+# Compound
+
+`Compound` is an explicit multi-shape projection wrapper.
+
+SimpleCADAPI 2.0 beta keeps integrated modeling centered on single `Solid`
+results, but product-level `Assembly` workflows can be projected into a flattened
+`Compound` with `make_compound_from_assembly_rcompound(...)`.
+
+The stable public geometry wrapper surface is:
+
+- `Vertex`
+- `Edge`
+- `Wire`
+- `Face`
+- `Solid`
+- `Compound`
+
+Use `Compound` when a workflow intentionally needs a flattened geometry
+projection. Do not use it as a substitute for `Assembly` product structure.
+
+For normal part modeling, keep using `Solid` as the body-level geometry. A
+single-body `Part` wraps exactly one `Solid`.