o Introduced ModelBuilder component that now hosts most of the logic from the project builder to construct the effective model. With maven-model-builder we now should have a rather slim module that tools can re-use for building models. The project builder is simply layered on top of the model builder.
maven/components/trunk/maven-compat/src/main/java/org/apache/maven/profiles/ProfileActivationContext.java
maven/components/trunk/maven-model-builder/src/main/java/org/apache/maven/model/resolver/