Informs this CollectionReader that the CAS TypeSystem has changed. The CPM calls this method immediately following the call to {@link #initialize(ResourceSpecifier,Map)}, and will call it again whenever the CAS TypeSystem changes.
In this method, the CollectionReader should use the {@link TypeSystem} to resolve the names ofType and Features to the actual {@link org.apache.uima.cas.Type} and{@link org.apache.uima.cas.Feature} objects, which can then be used during processing.
@param aTypeSystem the CAS TypeSystem
@throws ResourceInitializationException if the type system is not compatible with this Collection Reader