Layer

Group objects in drawing by function and to enforce standard for color, linetype, lineweight and other properties

Layer control the following:

• Objects on the layer are visible or hidden
• Color, linetype, lineweight for the objects on the layer
• Objects on the layer to be plot or not
• Objects on the layer locked and cannot be modified
• Objects display with different properties in different layout viewport

Every drawing includes a layer named 0

Layer 0 cannot be remove or rename