Macro
t ornil, and executes a body of code to print a page only if the variable ist. with-page var &body body
with-page macro binds var tot if a page is to be printed, ornil if it is to be skipped. The body is executed once, and is expected to draw the document only if var ist. Each call towith-page contributes a new page to the document. with-document-pageswith-page-transform