[{"name":"test","questions":[{"headline":"headline 1","answer":{"@id":"001","m_IMG":{"type":"06","img":{"@id":"1111","shape":[{"@src":"/1_1.jpg","@type":"Z05"},{"@src":"/1_2.jpg","@type":"Z08"}]}},"text":"text1"}},{"headline":"Headline 2","answer":[{"@id":"001","m_IMG":{"@type":"24","img":{"@id":"1111","shape":{"@src":"/2_1.jpg","@type":"Z05"}},"text":"Test2"}},{"@id":"002","m_IMG":{"@typeName":"","@type":"25","img":{"@id":"2222","shape":[{"@src":"/2_1.jpg","@type":"Z05"},{"@src":"2_2.jpg","@type":"Z08"}]}},"text":"Test3"}]}]}]

db.collection.aggregate()