Each layer standard contains the following component fields.
| Value | Description |
|---|---|
| Field Name | Identifies the field. Field names should be as consistent as possible across layering systems to aid in translation. |
| Optional | When Yes, allows the field to be omitted from the end of the layer name. Optional layer fields cannot precede a required layer field unless the match option is Yes so that the fields can be identified according to a match against specific descriptions. |
| Max Width | Represents the maximum width in characters that can be used. |
| Fixed Width | When Yes, prevents a field from being shortened from the max width setting. |
| Wildcard | An AutoCAD wildcard pattern that the field must match. |
| Match Description | When Yes, recognizes the field only if it exactly matches a description. You can omit fields from the middle of layer names. For example, an AIA layer may be made up of <discipline> <major> <minor>, or <discipline> <major> <status>, or <discipline> <major> <minor> <status>, as the <minor> field may not precede the <status> field and can be determined only by matching the field value against valid <minor> field descriptions. Note: When omitting fields from layer names, verify that the omitted field Match Description property is No. This ensures that the layer name specified can be created.
|
| Delimiter | Specifies the character used to separate fields with no fixed width. Delimiters are often also used in fixed-width fields for clarity. |
| Default | A predefined value for those field names that are not optional within the layer. |