function Get-ConfigurationDataMapValue {
    [CmdletBinding()]
    Param(
        [Parameter(Mandatory=$true)]
        $Map,

        [Parameter(Mandatory=$true)]
        [string]
        $Key,

        [AllowNull()]
        $DefaultValue = $null
    )

    if(-not (Test-ConfigurationDataMapContainsKey -Map $Map -Key $Key)){
        return $DefaultValue
    }

    return $Map[$Key]
}