The syntax for a namespace is as follows:
-- ... (the namespace body)
Refer to this section for a detailed explanation of what may appear in the body of a namespace.
Values declared within a namespace can be read outside of the namespace using the "dot" operator:
Hence they are also called global variables. Overwriting these values is not allowed.
Canvas Preamble Block
Each Style program must contain a canvas preamble block, a special type of namespace which describes the width and height of the canvas. For example, preamble block
width = 800
height = 700
tells Penrose that the drawing canvas should have a width of 800 pixels and a height of 700 pixels.