Public/Get-BlogArticle.ps1

function Get-BlogArticle {
    [OutputType('pscustomobject')]
    [CmdletBinding()]
    param
    (
        [Parameter(Mandatory)]
        [ValidateNotNullOrEmpty()]
        [string]$RssFeedUrl
    )

    $ErrorActionPreference = 'Stop'

    try {
        $progBefore = $ProgressPreference
        $ProgressPreference = 'SilentlyContinue'
        $content = [xml](Invoke-WebRequest -Uri $RssFeedUrl).Content
        foreach ($item in $content.rss.channel.item) {
            $postText = $item.encoded.'#cdata-section'
            $output = @{
                'Title'           = $item.title
                'Link'            = $item.link
                'PublicationDate' = $item.pubDate
                'Text'            = $postText
            }
            [pscustomobject]$output
        }
    } catch {
        $PSCmdlet.ThrowTerminatingError($_)
    } finally {
        $ProgressPreference = $progBefore
    }
}