Scheme is a LISP dialect. More information can be found at http://www.swiss.ai.mit.edu/projects/scheme/ and by reading ProgrammingLanguages?.
14 pages link to Scheme:
lib/main.php:944: Notice: PageInfo: Cannot find action page
lib/main.php:839: Notice: PageInfo: Unknown action
lib/plugin/WlugLicense.php:99: Warning: Invalid argument supplied for foreach()