code: public final ImmutableList<TaxonomyTerm> terms(final String taxonomy) {
        ImmutableList<TaxonomyTerm> terms = taxonomyTerms.get(taxonomy);
        return terms != null ? terms : ImmutableList.of();
     }
docs: An immutable list of terms associated with this post from a specified taxonomy.
  @param taxonomy The taxonomy.
  @return The list of terms.