Syslog-ng prepends <[0-9]+> to my messages

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http://serverfault.com – I'm writing some parsing logic for syslog-ng messages and am noticing that for many of the commands syslog-ng prepends a <[0-9]+> string to most of my messages. Here is an example from me running sudo: <85>Aug 2 09:42:09 sholsapp-ld sudo: sholsapp : TTY=pts/28 ; PWD=/home/sholsapp ; USER=root ; COMMAND=/bin/ls What is the meaning/significance of the <85>? (HowTos)