Feature Representation

In addition to the generic FME feature attributes that FME Workbench adds to all features (see About Feature Attributes), this format adds the format-specific attributes described in this section.

DLG features consist of geometry, linkages, and attribute code information. All DLG FME features contain the dlg_type attribute, which identifies the geometric type as well as several other standard attributes and are listed in the following table.

Attribute Name

Contents

dlg_type

The DLG geometric type of this entity.

Range:

dlg_point|
dlg_line|
dlg_area

Default: No default

dlg_element_number

The element's internal identification number.

The numbers are unique, positive, and sequential within each element type.

Range: 1 - 32000

dlg_record_type

The character element type of the feature. Valid values include:

N = Node Element

L = Line Element

A = Area Element

dlg_num_text_characters

Number of pairs of text characters attached to the feature.

Although this field is present within the DLG format, it is not currently used.

Range: 1 - 32000

dlg_linkage{#}

A list of linkages. These values refer to the features by their dlg_element_number. These linkages have different uses depending on their context. For example, a linkage list on an area feature refers to the line features that form the boundary of the area.

Note: For area features, linkages with a value of zero are not included in this list.

Range: 1 - 32000

dlg_num_attribute_codes

Number of attribute codes attached to the feature.

Range: 1 - 32000

dlg_attribute_code{#}.major

A list of major attribute codes. This list will have a maximum of 12 entries.

Range: 0 - 999

dlg_attribute_code{#}.minor

A list of minor attribute codes. This list will have a maximum of 12 entries.

Range: 0 - 9999

dlg_attribute_code{#}.

padmajor

This list is identical to the dlg_attribute_code{#}.major list except all values in this list are padded with zeros to exactly three character places.

For example, if dlg_attribute_code{0}.major was 90, dlg_attribute_code{0}.padmajor would be 090.

Range: 000 - 999

dlg_attribute_code{#}.

padminor

This list is identical to the dlg_attribute_code{#}.minor list except all values in this list are padded with zeros to exactly four character places.

For example, if dlg_attribute_code{0}.minor was 214, dlg_attribute_code{0}.padminor would be 0214.

Range: 0000 - 9999

dlg_attribute_code{#}.

partminor1

This list contains the first character of the corresponding entry in the dlg_attribute_code{#}.padminor list.

For example, if dlg_attribute_code{0}.padminor was 0214, dlg_attribute_code{0}.partminor1 would be 0.

Range: 0 - 9

dlg_attribute_code{#}. partminor2

This list contains the second character of the corresponding entry in the dlg_attribute_code{#}.padminor list.

For example, if dlg_attribute_code{0}.padminor was 0214, dlg_attribute_code{0}.partminor2 would be 2.

Range: 0 - 9

dlg_attribute_code{#}. partminor34

This list contains the third and fourth characters of the corresponding entry in the dlg_attribute_code{#}.padminor list.

For example, if dlg_attribute_code{0}.padminor was 0214, dlg_attribute_code{0}.partminor34 would be 14.

Range: 0 - 9

dlg_code_list

A text string containing all major and minor codes assigned to this feature, in the following format:

Range: <empty string> | <code list>
<code list> = (<major code>-<minor code>
[,<major code>-<minor code>]*)

For example, if the feature had major and minor code pairs of 180/201, 180/605, and 180/210, the string value of dlg_code_list attribute would be “(180-201,180-605,180-210)”

Depending on the geometric type, the feature may contain additional feature coding attributes specific to the geometric type. These are described in subsequent sections.