The optional applyColor attribute shows if the layer color supersedes colors of the model entities associated with this layer. The default value is FALSE.
The optional size attribute defines a recommended size for visualization of an infinite drawable element such as plane, cylinder, axis, etc., or objects without explicit geometric parameters (e.g. coordinate system).
The optional transparency attribute defines the transparency property of a model entity.
Source
<xs:element name="Layer" type="LayerType"><xs:annotation><xs:documentation>The global Layer element defines the model layer with associated model entities stored in the direct references.</xs:documentation></xs:annotation></xs:element>