Layers
- Last UpdatedDec 05, 2025
- 1 minute read
Layers (LAYE) are owned by VIEWs and are administrative elements used to group together annotation elements. Layers may own Dimension elements, Label elements and View Note elements. Usually, different Layers are used for different functions, and the function of a Layer is defined by its PURPose attribute. The PURP attribute is used to control the types of element that the Layer can own.
The PURP (Purpose) attribute of a Layer is set to a (four character) word, for example:
PURP DIMS
The PURP attribute may also be used to identify the Layer in other commands.
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Example: |
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UPDATE LAYE DIMS HIGhlight PURPose DIMS highlight the Layer in the current view with its PURP attribute set to DIMS |
for further information on the HIGHLIGHT command, see Highlighting Displayed Elements.
The LVIS attribute controls the visibility of a Layer. It can be set to TRUE or FALSE. This enables different types of annotation to be switched on and off.
Note: Where Layers and Layer members have common attributes, the values of those attributes are cascaded down from the Layer.