(1) ChainList

u32 chain_root_list_tag	Describes the tags of ChainRootList. Please specify the tags shown below. TAG_CHAIN_ROOT_LIST 0x00240000
u32 chain_root_list_header_size	Describes the ChainRootListHeader byte size.
u32 chain_root_list_size	Describes the ChainRootList byte size.
u32 chain_root_list_num	Describes the ChainRoot number.
u32 chain_root_num_byte	Describes the byte size of each ChainRoot.
ChainRoot	This is the ChainRoot area.

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u32 chain_root_tag	Describes the tags of ChainRoot. Please specify the tags shown below. TAG_CHAIN_ROOT 0x00240100
u32 this_chain_root_index	Describes this ChainRoot index number.
u32 chain_root_size	Describes the ChainRoot byte size.
u32 chain_root_name_index	Uses a NameList index number to describe the ChainRoot name.
u32 chain_root_type	Describes the ChainRoot type. Please specify 0x0 as the default.
u32 obj_num	Describes the Obj number linked from the ChainRoot.
u32 external_obj_num	Describes the Obj number linked from an external file reference ChainRoot.
u32 anim_index	Uses an AnimGroup index number to describe the ChainRoot animation.
u32 joint_index	Describes the Joint index number that is linked from the ChainRoot.
u32 obj_index	Describes the Obj index number that is linked from the ChainRoot. If obj_num = 0, this field is not described.
u32 external_obj_file_name_index	If the Obj that is linked from the ChainRoot references an external file, that file name is described with an ExternalNameList index number. Please do not include the directory name etc. when describing this file name. If external_obj_num = 0, this field is not described.
u32 external_obj_name_index	If the Obj that is linked from the ChainRoot references an external file, that Obj name is described with an ExternalNameList index number. If external_obj_num = 0, this field is not described.

Appendix ... about IK System

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