A list of EObjects adapted to Consumer and invoked in apply(). Context and progress monitor, apply and createInstance either throws Exception or wraps it maybe in ConfigurationException and injects builder's marker.
InterpolatingBuilder - interpolates tokens in features. Own properties, flag to chain with context and path. Features to interpolate - all String features by default.
CallBuilder - similar to Call in Exec, possibly extract common functionality to Ncore or use Call as-is - shall be adaptable to consumer then.