How Spam List mapping is done to spam.lists.conf file

Fri Apr 7 09:47:16 UTC 2017

Greetings !!
Mailscanner version: MailScanner-5.0.3-7  Ubuntu 14.04.5

# cat   /etc/MailScanner/spam.lists.conf

SORBS dnsbl.sorbs.net
SPAMHAUS zen.spamhaus.org
SPAMCOP bl.spamcop.net

# cat /etc/MailScanner.conf
...
Spam List Definitions = %etc-dir%/spam.lists.conf
Spam Checks = yes
Spam Domain List =
Spam List =  SBL+XBL

How is spam list mapped to the spam.lists.conf file, i cant find any key ?
for example how is SBL+XBL or spamhaus-ZEN  mapped to ? the SBL+XBL or
spamhaus-ZEN is nowhere in spam.lists.conf  file too
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