The primitive descriptions in this manual use a consistent format to define the function of each primitive. The additional categories Description, Note, Examples, and See Also are included with those primitives that require additional explanation. To help you more clearly interpret the primitive descriptions, this section will provide you with an explanation of each description category. Format The Format section illustrates the primitive's basic syntax. Argument names, which you substitute with your specific input values, are presented in lower-case text.
Some primitives have optional arguments which are represented in non-bold text.
Optional arguments can be omitted when using a primitive in order to reduce the amount of information you must type. In these cases, default values are used. Optional arguments are omitted by truncating the argument list, not by leaving an argument's position blank. In contrast, the fifth and sixth arguments have been omitted in this example. The Arguments section describes what each argument in the primitive's format is intended to represent.