system:
        default:
            fieldtypes:
                ezrichtext:
                    classes:
                        paragraph:
                            choices: ['class1_p', 'class2_p']
                            required: true
                            default_value: 'class1_p'
                            multiple: true
                     attributes:
                         paragraph:
                             'select-single-attr-p':
                                 type: 'choice'
                                 multiple: false
                                 required: false
                                 choices: ['value1_p', 'value2_p']
                                 default_value: null
                             'boolean-attr-p':
                                 type: 'boolean'
                                 default_value: true