return generationDirectory;
    }

    public File getImportVocabTokenTypesDirectory() {
        return importVocabTokenTypesDirectory;
    }

    void setImportVocabTokenTypesDirectory(File importVocabTokenTypesDirectory) {
        this.importVocabTokenTypesDirectory = importVocabTokenTypesDirectory;
    }

    /**
     * Is the grammar file modeled by this plan out of considered out of date?

                    final GenerationPlan importVocabGrammarGenerationPlan = locateOrBuildGenerationPlan(
                            importVocabGrammarFileMetadata);
                    generationPlan.setImportVocabTokenTypesDirectory(
                            importVocabGrammarGenerationPlan.getGenerationDirectory());
                    if (importVocabGrammarGenerationPlan.isOutOfDate()) {