code: public static <FACETTYPE extends Facet<?>> Set<Class<FACETTYPE>> getRequiredFacets(final Class<?> inspectedType)
     {
        return getRelatedFacets(inspectedType, FacetConstraintType.REQUIRED);
     }
docs: Inspect the given {@link Class} for any {@link FacetConstraintType#REQUIRED} dependency {@link Facet} types.