What does (epoch 0 < 2 ) mean?

[Scott C. Kennedy]

Recently, I decided to check for outdated files... (edited for brevity)

    biko-7:~ sck$ sudo port selfupdate && port outdated
    --->  Updating the ports tree
    --->  Updating MacPorts base sources using rsync
    MacPorts base version 1.9.2 installed,
    MacPorts base version 1.9.2 downloaded.
    --->  MacPorts base is already the latest version

    The ports tree has been updated. To upgrade your installed ports, you should run
      port upgrade outdated
    The following installed ports are outdated:
    atk                            1.33.6_0 < 1.32.0_0  (epoch 0 < 2) 
    gdk-pixbuf2                    2.23.0_1 < 2.22.1_1  (epoch 0 < 2) 
    biko-7:~ sck$

So, I went and updated....

    biko-7:~ sck$ bin/port_upgrade.sh
    + sudo port selfupdate
    --->  Updating the ports tree
    --->  Updating MacPorts base sources using rsync
    MacPorts base version 1.9.2 installed,
    MacPorts base version 1.9.2 downloaded.
    --->  MacPorts base is already the latest version

    The ports tree has been updated. To upgrade your installed ports, you should run
      port upgrade outdated
    + port outdated
    The following installed ports are outdated:
    atk                            1.33.6_0 < 1.32.0_0  (epoch 0 < 2) 
    gdk-pixbuf2                    2.23.0_1 < 2.22.1_1  (epoch 0 < 2) 
    + sudo port clean outdated
    --->  Cleaning atk
    --->  Cleaning gdk-pixbuf2
    + sudo port upgrade -Ru outdated
    --->  Computing dependencies for atk
    --->  Fetching atk
    --->  Attempting to fetch atk-1.32.0.tar.bz2 from
    http://distfiles.macports.org/atk
    --->  Verifying checksum(s) for atk
    --->  Extracting atk
    --->  Configuring atk
    --->  Building atk
    --->  Staging atk into destroot
    --->  Computing dependencies for atk
    --->  Installing atk @1.32.0_0
    --->  Deactivating atk @1.33.6_0
    --->  Activating atk @1.32.0_0
    --->  Cleaning atk
    --->  Computing dependencies for gdk-pixbuf2
    --->  Fetching gdk-pixbuf2
    --->  Attempting to fetch gdk-pixbuf-2.22.1.tar.bz2 from
    http://distfiles.macports.org/gdk-pixbuf2
    --->  Verifying checksum(s) for gdk-pixbuf2
    --->  Extracting gdk-pixbuf2
    --->  Configuring gdk-pixbuf2
    --->  Building gdk-pixbuf2
    --->  Staging gdk-pixbuf2 into destroot
    --->  Computing dependencies for gdk-pixbuf2
    --->  Installing gdk-pixbuf2 @2.22.1_1
    --->  Deactivating gdk-pixbuf2 @2.23.0_1
    --->  Activating gdk-pixbuf2 @2.22.1_1
    --->  Cleaning gdk-pixbuf2
    --->  Uninstalling gdk-pixbuf2 @2.23.0_1
    biko-7:~ sck$

But, I uninstalled the "newer" versions and had the older ones? What happened?
According to 'port outdated' I am running the most recent versions, although
I've downloaded  newer version but not compiled it.

Scott
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