Here is a list of all struct and union fields with links to the structures/unions they belong to:

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aaab_version : _dwg_object_ASSOC3POINTANGULARDIMACTIONBODY , _dwg_object_ASSOCALIGNEDDIMACTIONBODY , _dwg_object_ASSOCARRAYACTIONBODY , _dwg_object_ASSOCARRAYMODIFYACTIONBODY , _dwg_object_ASSOCMLEADERACTIONBODY , _dwg_object_ASSOCORDINATEDIMACTIONBODY , _dwg_object_ASSOCROTATEDDIMACTIONBODY
aab_version : _dwg_object_ASSOC3POINTANGULARDIMACTIONBODY , _dwg_object_ASSOCALIGNEDDIMACTIONBODY , _dwg_object_ASSOCARRAYACTIONBODY , _dwg_object_ASSOCARRAYMODIFYACTIONBODY , _dwg_object_ASSOCBLENDSURFACEACTIONBODY , _dwg_object_ASSOCEDGECHAMFERACTIONBODY , _dwg_object_ASSOCEDGEFILLETACTIONBODY , _dwg_object_ASSOCEXTENDSURFACEACTIONBODY , _dwg_object_ASSOCEXTRUDEDSURFACEACTIONBODY , _dwg_object_ASSOCFILLETSURFACEACTIONBODY , _dwg_object_ASSOCLOFTEDSURFACEACTIONBODY , _dwg_object_ASSOCMLEADERACTIONBODY , _dwg_object_ASSOCNETWORKSURFACEACTIONBODY , _dwg_object_ASSOCOFFSETSURFACEACTIONBODY , _dwg_object_ASSOCORDINATEDIMACTIONBODY , _dwg_object_ASSOCPATCHSURFACEACTIONBODY , _dwg_object_ASSOCPLANESURFACEACTIONBODY , _dwg_object_ASSOCRESTOREENTITYSTATEACTIONBODY , _dwg_object_ASSOCREVOLVEDSURFACEACTIONBODY , _dwg_object_ASSOCROTATEDDIMACTIONBODY , _dwg_object_ASSOCSWEPTSURFACEACTIONBODY , _dwg_object_ASSOCTRIMSURFACEACTIONBODY
aap_version : _dwg_abstractobject_ASSOCARRAYPARAMETERS , _dwg_object_ASSOCACTIONPARAM , _dwg_object_ASSOCASMBODYACTIONPARAM , _dwg_object_ASSOCCOMPOUNDACTIONPARAM , _dwg_object_ASSOCEDGEACTIONPARAM , _dwg_object_ASSOCFACEACTIONPARAM , _dwg_object_ASSOCOBJECTACTIONPARAM , _dwg_object_ASSOCOSNAPPOINTREFACTIONPARAM , _dwg_object_ASSOCPATHACTIONPARAM , _dwg_object_ASSOCPOINTREFACTIONPARAM , _dwg_object_ASSOCVERTEXACTIONPARAM
absolute_ref : _dwg_object_ref
absref : _dwg_resbuf
ACADMAINTVER : _dwg_header_variables
acds : _dwg_struct
acis_data : _dwg_entity_3DSOLID , _dwg_entity_EXTRUDEDSURFACE , _dwg_entity_LOFTEDSURFACE , _dwg_entity_NURBSURFACE , _dwg_entity_PLANESURFACE , _dwg_entity_REVOLVEDSURFACE , _dwg_entity_SWEPTSURFACE , _dwg_object_ACSH_BREP_CLASS , _dwg_object_ASSOCASMBODYACTIONPARAM
acis_empty : _dwg_entity_3DSOLID , _dwg_entity_EXTRUDEDSURFACE , _dwg_entity_LOFTEDSURFACE , _dwg_entity_NURBSURFACE , _dwg_entity_PLANESURFACE , _dwg_entity_REVOLVEDSURFACE , _dwg_entity_SWEPTSURFACE , _dwg_object_ACSH_BREP_CLASS , _dwg_object_ASSOCASMBODYACTIONPARAM
acis_empty2 : _dwg_entity_3DSOLID , _dwg_entity_EXTRUDEDSURFACE , _dwg_entity_LOFTEDSURFACE , _dwg_entity_NURBSURFACE , _dwg_entity_PLANESURFACE , _dwg_entity_REVOLVEDSURFACE , _dwg_entity_SWEPTSURFACE , _dwg_object_ACSH_BREP_CLASS , _dwg_object_ASSOCASMBODYACTIONPARAM
acis_empty_bit : _dwg_entity_3DSOLID , _dwg_entity_EXTRUDEDSURFACE , _dwg_entity_LOFTEDSURFACE , _dwg_entity_NURBSURFACE , _dwg_entity_PLANESURFACE , _dwg_entity_REVOLVEDSURFACE , _dwg_entity_SWEPTSURFACE , _dwg_object_ACSH_BREP_CLASS , _dwg_object_ASSOCASMBODYACTIONPARAM
acis_index : _dwg_3DSOLID_wire
acis_sab_hdl : _dwg_struct
ACMECOMMANDHISTORY : _dwg_object_object
ACMESCOPE : _dwg_object_object
ACMESTATEMGR : _dwg_object_object
ACSH_BOOLEAN_CLASS : _dwg_object_object
ACSH_BOX_CLASS : _dwg_object_object
ACSH_BREP_CLASS : _dwg_object_object
ACSH_CHAMFER_CLASS : _dwg_object_object
ACSH_CONE_CLASS : _dwg_object_object
ACSH_CYLINDER_CLASS : _dwg_object_object
ACSH_EXTRUSION_CLASS : _dwg_object_object
ACSH_FILLET_CLASS : _dwg_object_object
ACSH_HISTORY_CLASS : _dwg_object_object
ACSH_LOFT_CLASS : _dwg_object_object
ACSH_PYRAMID_CLASS : _dwg_object_object
ACSH_REVOLVE_CLASS : _dwg_object_object
ACSH_SPHERE_CLASS : _dwg_object_object
ACSH_SWEEP_CLASS : _dwg_object_object
ACSH_TORUS_CLASS : _dwg_object_object
ACSH_WEDGE_CLASS : _dwg_object_object
act_measurement : _dwg_DIMENSION_common , _dwg_entity_ARC_DIMENSION , _dwg_entity_DIMENSION_ALIGNED , _dwg_entity_DIMENSION_ANG2LN , _dwg_entity_DIMENSION_ANG3PT , _dwg_entity_DIMENSION_DIAMETER , _dwg_entity_DIMENSION_LINEAR , _dwg_entity_DIMENSION_ORDINATE , _dwg_entity_DIMENSION_RADIUS , _dwg_entity_LARGE_RADIAL_DIMENSION
action_index : _dwg_object_ASSOC2DCONSTRAINTGROUP , _dwg_object_ASSOCACTION , _dwg_object_ASSOCNETWORK , _dwg_object_ASSOCVARIABLE
action_offset_x : _dwg_object_BLOCKFLIPACTION , _dwg_object_BLOCKMOVEACTION , _dwg_object_BLOCKSTRETCHACTION
action_offset_y : _dwg_object_BLOCKFLIPACTION , _dwg_object_BLOCKMOVEACTION , _dwg_object_BLOCKSTRETCHACTION
action_type : _dwg_object_ASSOCEDGEACTIONPARAM
actionbody : _dwg_object_ASSOC2DCONSTRAINTGROUP , _dwg_object_ASSOC3POINTANGULARDIMACTIONBODY , _dwg_object_ASSOCACTION , _dwg_object_ASSOCALIGNEDDIMACTIONBODY , _dwg_object_ASSOCMLEADERACTIONBODY , _dwg_object_ASSOCNETWORK , _dwg_object_ASSOCORDINATEDIMACTIONBODY , _dwg_object_ASSOCROTATEDDIMACTIONBODY , _dwg_object_ASSOCVARIABLE
actions : _dwg_object_ASSOC2DCONSTRAINTGROUP , _dwg_object_ASSOCMLEADERACTIONBODY , _dwg_object_ASSOCNETWORK , _dwg_object_BLOCKARRAYACTION , _dwg_object_BLOCKFLIPACTION , _dwg_object_BLOCKLOOKUPACTION , _dwg_object_BLOCKMOVEACTION , _dwg_object_BLOCKPOLARSTRETCHACTION , _dwg_object_BLOCKROTATEACTION , _dwg_object_BLOCKSCALEACTION , _dwg_object_BLOCKSTRETCHACTION
active_cycles : _dwg_EVAL_Node
active_viewport : _dwg_object_LAYOUT
adb_version : _dwg_object_ASSOCDIMDEPENDENCYBODY , _dwg_object_BLOCKPARAMDEPENDENCYBODY
additional_data_flag : _dwg_TABLE_Cell
address : _dwg_object , _dwg_secondheader , _dwg_secondheader_sections , _dwg_section , _encrypted_section_header , Object_Map
affects_graphics : _dwg_FileDepList_Files
ALDIMOBJECTCONTEXTDATA : _dwg_object_object
algo_id : _dwg_security
align_angle : _dwg_entity_EXTRUDEDSURFACE , _dwg_entity_SWEPTSURFACE , _dwg_object_ACSH_EXTRUSION_CLASS , _dwg_object_ACSH_SWEEP_CLASS
align_direction : _dwg_entity_LOFTEDSURFACE
align_option : _dwg_object_ACSH_EXTRUSION_CLASS , _dwg_object_ACSH_SWEEP_CLASS
align_perpendicular : _dwg_object_BLOCKALIGNMENTPARAMETER
align_space : _dwg_object_MLEADERSTYLE
align_start : _dwg_entity_EXTRUDEDSURFACE , _dwg_entity_SWEPTSURFACE
alignment : _dwg_entity_ARCALIGNEDTEXT , _dwg_MLEADER_Content_MText , _dwg_object_LTYPE
alignment_pt : _dwg_entity_ATTDEF , _dwg_entity_ATTRIB , _dwg_entity_TEXT , _dwg_object_MTEXTATTRIBUTEOBJECTCONTEXTDATA , _dwg_object_TEXTOBJECTCONTEXTDATA
ALIGNMENTPARAMETERENTITY : _dwg_object_entity
alpha : _dwg_color
alpha_raw : _dwg_color
alpha_type : _dwg_color
alt_hlt : _dwg_object_TVDEVICEPROPERTIES
alt_hltcolor : _dwg_object_TVDEVICEPROPERTIES
ambient_color : _dwg_entity_VIEWPORT , _dwg_object_MATERIAL , _dwg_object_VIEW , _dwg_object_VPORT
ANGBASE : _dwg_header_variables
ANGDIMOBJECTCONTEXTDATA : _dwg_object_object
ANGDIR : _dwg_header_variables
angle : _dwg_abstractentity_UNDERLAY , _dwg_entity_HATCH , _dwg_entity_MPOLYGON , _dwg_HATCH_DefLine , _dwg_object_BLOCKANGULARCONSTRAINTPARAMETER , _dwg_object_BLOCKROTATIONPARAMETER
angle_desc : _dwg_object_BLOCKPOLARPARAMETER , _dwg_object_BLOCKROTATIONPARAMETER
angle_name : _dwg_object_BLOCKPOLARPARAMETER , _dwg_object_BLOCKROTATIONPARAMETER
angle_offset : _dwg_object_BLOCKFLIPACTION , _dwg_object_BLOCKMOVEACTION , _dwg_object_BLOCKSTRETCHACTION
angle_value_set : _dwg_object_BLOCKPOLARPARAMETER , _dwg_object_BLOCKROTATIONPARAMETER
annot_type : _dwg_entity_LEADER
annotative_app : _dwg_entity_ATTDEF , _dwg_entity_ATTRIB
annotative_data_bytes : _dwg_entity_ATTDEF , _dwg_entity_ATTRIB
annotative_data_size : _dwg_entity_ATTDEF , _dwg_entity_ATTRIB
annotative_short : _dwg_entity_ATTDEF , _dwg_entity_ATTRIB
ANNOTSCALEOBJECTCONTEXTDATA : _dwg_object_object
anonymous : _dwg_object_BLOCK_HEADER
antialiasing_level : _dwg_object_TVDEVICEPROPERTIES
app_dwg_version : _dwg_header
app_maint_version : _dwg_header
appid : _dwg_entity_MTEXT
APPID : _dwg_object_object
APPID_CONTROL : _dwg_object_object
APPID_CONTROL_OBJECT : _dwg_header_variables
appid_index : _dwg_entity_eed_data::eed_data_t
appinfo : _dwg_struct
appinfo_name : _dwg_appinfo
appinfohistory : _dwg_struct
appname : _dwg_class
apptype : Dwg_DXFClass
ARC : _dwg_object_entity
ARC_DIMENSION : _dwg_object_entity
arc_end_param : _dwg_entity_ARC_DIMENSION
arc_handle : _dwg_entity_ARCALIGNEDTEXT
arc_length_parameterization : _dwg_entity_LOFTEDSURFACE
arc_pt : _dwg_object_ANGDIMOBJECTCONTEXTDATA
arc_start_param : _dwg_entity_ARC_DIMENSION
ARCALIGNEDTEXT : _dwg_object_entity
areafillparms : _dwg_MLINE_line
array : _inthash
array_index : _dwg_3DSOLID_material
arrow_end_symbol : _dwg_object_SECTIONVIEWSTYLE
arrow_handle : _dwg_entity_MULTILEADER , _dwg_LEADER_Line
arrow_head : _dwg_object_MLEADERSTYLE
arrow_head_size : _dwg_object_MLEADERSTYLE
arrow_position : _dwg_object_SECTIONVIEWSTYLE
arrow_size : _dwg_entity_MULTILEADER , _dwg_LEADER_Line , _dwg_MLEADER_AnnotContext
arrow_start_symbol : _dwg_object_SECTIONVIEWSTYLE
arrow_symbol : _dwg_object_DETAILVIEWSTYLE
arrow_symbol_color : _dwg_object_DETAILVIEWSTYLE , _dwg_object_SECTIONVIEWSTYLE
arrow_symbol_extension_length : _dwg_object_SECTIONVIEWSTYLE
arrow_symbol_size : _dwg_object_DETAILVIEWSTYLE , _dwg_object_SECTIONVIEWSTYLE
arrowhead : _dwg_LEADER_ArrowHead
arrowhead_on : _dwg_entity_LEADER
arrowhead_type : _dwg_entity_LEADER
arrowheads : _dwg_entity_MULTILEADER
asdap_class_version : _dwg_object_ASSOCASMBODYACTIONPARAM , _dwg_object_ASSOCEDGEACTIONPARAM , _dwg_object_ASSOCFACEACTIONPARAM , _dwg_object_ASSOCOBJECTACTIONPARAM , _dwg_object_ASSOCVERTEXACTIONPARAM
aspect_ratio : _dwg_header_variables , _dwg_object_VIEW , _dwg_object_VPORT
ASSOC2DCONSTRAINTGROUP : _dwg_object_object
ASSOC3POINTANGULARDIMACTIONBODY : _dwg_object_object
assoc_dep : _dwg_object_ASSOC3POINTANGULARDIMACTIONBODY , _dwg_object_ASSOCALIGNEDDIMACTIONBODY , _dwg_object_ASSOCMLEADERACTIONBODY , _dwg_object_ASSOCORDINATEDIMACTIONBODY , _dwg_object_ASSOCROTATEDDIMACTIONBODY
ASSOCACTION : _dwg_object_object
ASSOCACTIONPARAM : _dwg_object_object
ASSOCALIGNEDDIMACTIONBODY : _dwg_object_object
ASSOCARRAYACTIONBODY : _dwg_object_object
ASSOCARRAYMODIFYACTIONBODY : _dwg_object_object
ASSOCARRAYMODIFYPARAMETERS : _dwg_object_object
ASSOCARRAYPATHPARAMETERS : _dwg_object_object
ASSOCARRAYPOLARPARAMETERS : _dwg_object_object
ASSOCARRAYRECTANGULARPARAMETERS : _dwg_object_object
ASSOCASMBODYACTIONPARAM : _dwg_object_object
ASSOCBLENDSURFACEACTIONBODY : _dwg_object_object
ASSOCCOMPOUNDACTIONPARAM : _dwg_object_object
assocdep : _dwg_ASSOCPARAMBASEDACTIONBODY , _dwg_ASSOCSURFACEACTIONBODY , _dwg_object_ASSOC3POINTANGULARDIMACTIONBODY , _dwg_object_ASSOCGEOMDEPENDENCY , _dwg_object_ASSOCVALUEDEPENDENCY
ASSOCDEPENDENCY : _dwg_object_object
ASSOCDIMDEPENDENCYBODY : _dwg_object_object
ASSOCEDGEACTIONPARAM : _dwg_object_object
ASSOCEDGECHAMFERACTIONBODY : _dwg_object_object
ASSOCEDGEFILLETACTIONBODY : _dwg_object_object
ASSOCEXTENDSURFACEACTIONBODY : _dwg_object_object
ASSOCEXTRUDEDSURFACEACTIONBODY : _dwg_object_object
ASSOCFACEACTIONPARAM : _dwg_object_object
ASSOCFILLETSURFACEACTIONBODY : _dwg_object_object
ASSOCGEOMDEPENDENCY : _dwg_object_object
associated_annotation : _dwg_entity_LEADER
associated_ucs : _dwg_object_VIEW
associativity : _dwg_object_DIMASSOC
ASSOCLOFTEDSURFACEACTIONBODY : _dwg_object_object
ASSOCMLEADERACTIONBODY : _dwg_object_object
ASSOCNETWORK : _dwg_object_object
ASSOCNETWORKSURFACEACTIONBODY : _dwg_object_object
ASSOCOBJECTACTIONPARAM : _dwg_object_object
ASSOCOFFSETSURFACEACTIONBODY : _dwg_object_object
ASSOCORDINATEDIMACTIONBODY : _dwg_object_object
ASSOCOSNAPPOINTREFACTIONPARAM : _dwg_object_object
ASSOCPATCHSURFACEACTIONBODY : _dwg_object_object
ASSOCPATHACTIONPARAM : _dwg_object_object
ASSOCPERSSUBENTMANAGER : _dwg_object_object
ASSOCPLANESURFACEACTIONBODY : _dwg_object_object
ASSOCPOINTREFACTIONPARAM : _dwg_object_object
ASSOCRESTOREENTITYSTATEACTIONBODY : _dwg_object_object
ASSOCREVOLVEDSURFACEACTIONBODY : _dwg_object_object
ASSOCROTATEDDIMACTIONBODY : _dwg_object_object
ASSOCSWEPTSURFACEACTIONBODY : _dwg_object_object
ASSOCTRIMSURFACEACTIONBODY : _dwg_object_object
ASSOCVALUEDEPENDENCY : _dwg_object_object
assocvariable : _dwg_object_BLOCKUSERPARAMETER
ASSOCVARIABLE : _dwg_object_object
ASSOCVERTEXACTIONPARAM : _dwg_object_object
attach_bottom : _dwg_entity_MULTILEADER , _dwg_object_MLEADERSTYLE
attach_dir : _dwg_entity_MULTILEADER , _dwg_LEADER_Node , _dwg_MLEADER_AnnotContext , _dwg_object_MLEADERSTYLE
attach_left : _dwg_object_MLEADERSTYLE
attach_right : _dwg_object_MLEADERSTYLE
attach_top : _dwg_entity_MULTILEADER , _dwg_object_MLEADERSTYLE
attachment : _dwg_DIMENSION_common , _dwg_entity_ARC_DIMENSION , _dwg_entity_DIMENSION_ALIGNED , _dwg_entity_DIMENSION_ANG2LN , _dwg_entity_DIMENSION_ANG3PT , _dwg_entity_DIMENSION_DIAMETER , _dwg_entity_DIMENSION_LINEAR , _dwg_entity_DIMENSION_ORDINATE , _dwg_entity_DIMENSION_RADIUS , _dwg_entity_LARGE_RADIAL_DIMENSION , _dwg_entity_MTEXT , _dwg_object_MTEXTOBJECTCONTEXTDATA
attdef : _dwg_LEADER_BlockLabel
ATTDEF : _dwg_object_entity
attdef : _dwg_TABLE_AttrDef , _dwg_TableCellContent_Attr
attdef_class_version : _dwg_entity_ATTDEF
ATTDIA : _dwg_header_variables
attenuation_end_limit : _dwg_entity_LIGHT
attenuation_start_limit : _dwg_entity_LIGHT
attenuation_type : _dwg_entity_LIGHT
ATTMODE : _dwg_header_variables
attr_defs : _dwg_TABLE_Cell
ATTREQ : _dwg_header_variables
ATTRIB : _dwg_object_entity
attribs : _dwg_entity_INSERT , _dwg_entity_MINSERT , _dwg_entity_TABLE
attrs : _dwg_TableCellContent
AUNITS : _dwg_header_variables
AUPREC : _dwg_header_variables
AUTHOR : _dwg_summaryinfo
auto_height : _dwg_entity_MTEXT , _dwg_object_MTEXTOBJECTCONTEXTDATA
autotransform : _dwg_MATERIAL_mapper
aux_intro : _dwg_auxheader
auxheader : _dwg_struct
auxheader_address : _dwg_auxheader
auxheader_size : _dwg_auxheader
av_class_version : _dwg_object_ASSOCVARIABLE
axis_base_pt : _dwg_entity_HELIX
axis_point : _dwg_entity_REVOLVEDSURFACE
axis_pt : _dwg_object_ACSH_REVOLVE_CLASS
axis_ratio : _dwg_entity_ELLIPSE
axis_vector : _dwg_entity_HELIX , _dwg_entity_REVOLVEDSURFACE
axis_x : _dwg_3DSOLID_wire
axis_y : _dwg_3DSOLID_wire
axis_z : _dwg_3DSOLID_wire
AXISMODE : _dwg_header_variables
AXISUNIT : _dwg_header_variables