XML dump of MySQL database don't include foreign key constraints. What can be the reason? sqldump(.sql) file list it

Question

I am accessing schema information of databases in XML format. I am taking dump of the database in XML format using the command below.

mysqldump --no-data --xml -u root -p bakerydb > bakerydb.xml

these dump don't list the foreign key constraints. Below part of the output is listed.

   <table_structure name="class_details">
        <field Field="id" Type="int(10)" Null="NO" Key="PRI" Extra="auto_increment" Comment="" />
        <field Field="course_id" Type="int(10)" Null="NO" Key="MUL" Extra="" Comment="" />
        <field Field="start_date" Type="date" Null="NO" Key="" Extra="" Comment="" />
        <field Field="end_date" Type="date" Null="NO" Key="" Extra="" Comment="" />
        <field Field="tutor_id" Type="int(10)" Null="NO" Key="MUL" Extra="" Comment="" />
        <key Table="class_details" Non_unique="0" Key_name="PRIMARY" Seq_in_index="1" Column_name="id" Collation="A" Cardinality="0" Null="" Index_type="BTREE" Comment="" Index_comment="" />
        <key Table="class_details" Non_unique="1" Key_name="fk_cources_offered_class_details" Seq_in_index="1" Column_name="course_id" Collation="A" Cardinality="0" Null="" Index_type="BTREE" Comment="" Index_comment="" />
        <key Table="class_details" Non_unique="1" Key_name="fk_employee_details_class_details" Seq_in_index="1" Column_name="tutor_id" Collation="A" Cardinality="0" Null="" Index_type="BTREE" Comment="" Index_comment="" />
        <options Name="class_details" Engine="InnoDB" Version="10" Row_format="Compact" Rows="0" Avg_row_length="0" Data_length="16384" Max_data_length="0" Index_length="32768" Data_free="7340032" Auto_increment="1" Create_time="2014-02-25 07:08:56" Collation="utf8_general_ci" Create_options="" Comment="" />
    </table_structure>

Same database lists the detailed foreign key constraint in sqldump. (.sql file). below that's mentioned.

DROP TABLE IF EXISTS `class_details`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `class_details` (
  `id` int(10) NOT NULL AUTO_INCREMENT,
  `course_id` int(10) NOT NULL,
  `start_date` date NOT NULL,
  `end_date` date NOT NULL,
  `tutor_id` int(10) NOT NULL,
  PRIMARY KEY (`id`),
  KEY `fk_cources_offered_class_details` (`course_id`),
  KEY `fk_employee_details_class_details` (`tutor_id`),
  CONSTRAINT `fk_employee_details_class_details` FOREIGN KEY (`tutor_id`) REFERENCES `employee_details` (`emp_id`),
  CONSTRAINT `fk_courses_offered_class_details` FOREIGN KEY (`course_id`) REFERENCES `courses_offered` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

Anyone know why they don't list parent table information? and the way, How we can get the details of foreign key constraints?

P.S. : storage engine is InnoDB.