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Structure Format (deprecated)

In this representation of extended entity data, the fields are stored with the tags forming part of the attribute names for each of the extended entity entries. The data is stored in a single structure in the FME feature named extended_data. As the extended entity data within AutoCAD is grouped into sections, with each section beginning with an application group code, the extended_data structure itself is also divided into different sections with each section beginning with extended_data{#}. The remainder of the attribute name consists of one of the parameters:

Extended Entity Parameter

Contents

application_name

The name of the application which the entity data is associated.

AutoCAD Code: 1001

autocad_layer{#}

The name of the layer the extended data is associated.

AutoCAD Code: 1003

string{#}

A character string value from 0 to 255 characters in length.

AutoCAD Code: 1000

three_reals{#}.real1

three_reals{#}.real2

three_reals{#}.real3

Three real numbers.

AutoCAD Code: 1010,1020,1030

world_position{#}.x

world_position{#}.y

world_position{#}.z

Three values represent the x, y, and z components of a world_position value.

AutoCAD Code: 1011, 1021, 1031

world_displacement{#}.x

world_displacement{#}.y

world_displacement{#}.z

Three values which represent a world displacement value.

AutoCAD Code: 1012, 1022, 1032

world_direction{#}.x

world_direction{#}.y

world_direction{#}.z

Three real values which represent a world direction vector.

AutoCAD Code: 1013,1023,1033

real{#}

A 64-bit floating point number.

AutoCAD Code: 1040

handle{#}

AutoCAD handle value.

AutoCAD Code: 1005

distance{#}

A 64-bit floating point number which represents a distance.

AutoCAD Code: 1041

scale{#}

A 64-bit floating point number which represents a scaling factor.

AutoCAD Code: 1042

16Bit_integer{#}

A 16 bit integer value.

AutoCAD Code: 1070

32Bit_integer{#}

A 32 bit integer value.

AutoCAD Code: 1071

For example, given the following extended entity data:

1001 C_NODE
1000 CONNOBJ_1=43F4
1000 COUNT=3
1000 CONNOBJ_2=43F3
1000 CONNOBJ_3=43F2
1005 163
1010 45.4
1020 -123.5
1030 0
1001 DPRINT
1000 postscript

The information will be stored in the FME feature using structure notation as follows:

Attribute Name

Attribute Value

extended_data{0}.application_name

C_NODE

extended_data{0}.string{0}

CONNOBJ_1=43F4

extended_data{0}.string{1}

COUNT=3

extended_data{0}.string{2}

CONNOBJ_2=43F3

extended_data{0}.string(3}

CONNOBJ_3=43F2

extended_data{0}.three_reals{0}.real1

45.4

extended_data{0}.three_reals{0}.real2

-123.5

extended_data{0}.three_reals{0}.real3

0

extended_data{0}.handle{0}

163

extended_data{1}.application_name

DPRINT

extended_data{1}.string{0}

postscript

Notice how, in this case, the AutoCAD codes are used to form extensions for the attribute names. Also notice how the extended_data items are grouped in the FME feature as they are within the drawing file.