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Re-organisation: <diffuse>, <ambient>, <emission>, <specular> are now groups with members <red>, <green>, <blue>, <factor>, <offset>, and their <*-prop> forms. Additionally, there's an option <property-base> that can be used to set a path that is prepended to all <*-prop> paths. It defaults to an empty string. Rationale: see model-howto.html.