Puppet users - Mar 2014 - Node scope variables

Greetings,

I could use some clarity on node scope, class scope, and best practices.  I 
have the following:

# Node definition

if $hostname == 'mynode-dev' {
    $app_version = '1.0'
    include robin_dev
}

# Class definition 

class robin_dev {
    if $app_version == undef {
        $app_version = '0.5'
    }
    include robin_dev::install
}

class robin_dev::install {
    package {
        "app_name":                       ensure =>
$robin_dev::app_version;
    }
}


My intent is to set $app_version within my node definition.  If 
$app_version is not set there, I 'd like it to default to a version that is 
set within class robin_dev itself, which is 0.5 in the above example.

While the above example works as I just described, i'm not understanding 
how $robin_dev::app_version referenced in class robin_dev::install returns 
"1.0" when I its assigned in the node definition.  I initially assumed
that
class robin_dev would need to re-assign the variable within the class 
itself like this:

# Class definition 

class robin_dev {
    if $app_version == undef {
        $version = '0.5'
    } else {

                    $version = $app_version

    include robin_dev::install
}


 class robin_dev::install {
    package {
        "app_name":                       ensure =>
$robin_dev::version;
    }
}


 Any insights would be appreciated.  Thank you.

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