[CentOS] What's the difference between nmcli fields ipv4.addresses and IP4.ADDRESS?

Hi All,

nmcli tool in CentOS 7.1 uses same fields with upper and lower case with
different meanings. What's the difference between pv4.addresses and
IP4.ADDRESS in "nmcli con show" command?

Where nmcli fields are documented? I searched online but didn't find nmcli
documentation. RHEL 7 Networking Guide doesn't explain nmcli options in
details.

I'd appreciate your comments.

Joe