zerodds-ast

The one model every frontend lowers into and every backend reads from.

A source-neutral core node space carries per-source typed facets, so a construct that exists in OMG IDL and not in ROS 2 IDL is a facet on a shared node rather than a second node kind. Twenty-one language columns and every wire probe read this model; none of them reads an IDL file.

This crate holds no layout and no bytes. What a member's offset is, which header frames it, how long the extent runs — that is zerodds-ast-layout's answer, computed per encoding and byte order.

See docs/specs/zerodds-ast-1.0.md for the model and the facet rules.