MyDscConfig.ps1

Configuration MyDscConfig {
    # Import the module that has the 'ServerType' configuration
    Import-DscResource -ModuleName Platform
    # Import the module that has the 'Application' Configuration
    Import-DscResource -ModuleName Product

    $ConfigurationData.AllNodes.Nodename {
        $ConfigurationData.Roles.($Node.Role).configurations.Foreach{
            $ConfigurationName = $_
            $ConfigurationParameters = $ConfigurationData.Roles.($Node.Role).($ConfigurationName)

            # This weird notation is to avoid scoping issues when invoking the DSC Composite Resource
            (Get-DscSplattedResource -ResourceName $ConfigurationName -ExecutionName "$($ConfigurationName)_inc" -Properties $ConfigurationParameters -NoInvoke).Invoke($ConfigurationParameters)
        }
    }
}