type:      map
mapping:
 "company":
    type:      str
    required:  yes
 "email":
    type:      str
 "employees":
    type:      seq
    sequence:
      - type:    map
        mapping:
         "code":
            type:      int
            required:  yes
         "name":
            type:      str
            required:  yes
         "email":
            type:      str
