Powershell functions to create some of the Linq2Xml classes like Xdocument, XElement, XNamespace, XName, XAttribute etc...

LinqXml.psm1

function XName {
    [CmdletBinding()]    
    param(
        [Parameter(Mandatory,Position=0)]
        [ValidateNotNullOrEmpty()]
        [string]$LocalName
    )
    process {
        [System.Xml.Linq.XName]$LocalName
    }
}

function XAttribute {
    [CmdletBinding(DefaultParameterSetName="createWithLocalName")]    
    param(
        [Parameter(Mandatory,Position=0,ParameterSetName="createWithLocalName")]
        [ValidateNotNullOrEmpty()]
        [string]$LocalName,
        [Parameter(Mandatory,Position=0,ParameterSetName="createWithXName")]
        [ValidateNotNullOrEmpty()]
        [System.Xml.Linq.XName]$Name,
        [Parameter(Mandatory,Position=1)]
        [ValidateNotNullOrEmpty()]
        [System.Object]$Value
    )
    process {
        switch($PSCmdlet.ParameterSetName) {
            "createWithLocalName" {
                New-Object System.Xml.Linq.XAttribute -ArgumentList @((XName -LocalName $LocalName),$Value)
            }
            "createWithXName" {
                New-Object System.Xml.Linq.XAttribute -ArgumentList @($Name,$Value)
            }
        }
    }
}

function XElement {
    [CmdletBInding(DefaultParameterSetName="createWithLocalName")]
    param(
        [Parameter(Mandatory,Position=0,ParameterSetName="createWithLocalName")]
        [ValidateNotNullOrEmpty()]
        [string]$LocalName,
        [Parameter(Mandatory,Position=0,ParameterSetName="createWithXName")]
        [ValidateNotNullOrEmpty()]
        [System.Xml.Linq.XName]$Name,
        [Parameter(Mandatory=$false,Position=1,ParameterSetName="createWithLocalName")]
        [Parameter(Mandatory=$false,Position=1,ParameterSetName="createWithXName")]
        [ValidateNotNull()]
        [scriptblock]$Content,
        [Parameter(Mandatory=$false,Position=0,ParameterSetName="parse")]
        [ValidateNotNull()]
        [string]$Text,
        [Parameter(Mandatory=$false,Position=0,ParameterSetName="load")]
        [ValidateScript({Test-Path $_})]
        $File
    )
    begin {
        switch($PSCmdlet.ParameterSetName) {
            "createWithLocalName" {
                $XElement = New-Object System.Xml.Linq.XElement -ArgumentList @(XName -LocalName $LocalName)
            }
            "createWithXName" {
                $XElement = New-Object System.Xml.Linq.XElement -ArgumentList $Name
            }
            "parse" {
                $XElement = [System.Xml.Linq.XElement]::Parse($Text)
            }
            "load" {
                $XElement = [System.Xml.Linq.XElement]::Load((Resolve-Path $File))
            }
        }
    }
    process {
        if($Content) {
            ([scriptblock]$Content).InvokeReturnAsIs() | foreach { $XElement.Add($_) }
        }
    }
    end {
        $XElement
    }
}

function XDocument {
    [CmdletBinding(DefaultParameterSetName="create")]
    param(
        [Parameter(Mandatory=$false,Position=0,ParameterSetName="create")]
        [ValidateNotNull()]
        [scriptblock]$Content,
        [Parameter(Mandatory=$false,Position=0,ParameterSetName="parse")]
        [ValidateNotNull()]
        [string]$Text,
        [Parameter(Mandatory=$false,Position=0,ParameterSetName="load")]
        [ValidateScript({Test-Path $_})]
        $Path
    )
    begin {
        switch($PSCmdlet.ParameterSetName) {
            "create" {
                $XDocument = New-Object System.Xml.Linq.XDocument
            }
            "parse" {
                $XDocument = [System.Xml.Linq.XDocument]::Parse($Text)
            }
            "load" {
                $XDocument = [System.Xml.Linq.XDocument]::Load((Resolve-Path $Path))
            }
        }
    }
    process {
        if($PSCmdlet.ParameterSetName -eq "create") {
            if($Content) {
                ([scriptblock]$Content).InvokeReturnAsIs() | foreach { $XDocument.Add($_) }
            }
        }
    }
    end {
        $XDocument
    }
}

function XComment {
    [CmdletBinding()]    
    param(
        [Parameter(Mandatory,Position=0)]
        [ValidateNotNullOrEmpty()]
        [string]$Comment
    )
    process {
        [System.Xml.Linq.XComment]$Comment
    }
}

function XCData {
    [CmdletBinding()]    
    param(
        [Parameter(Mandatory,Position=0)]
        [ValidateNotNullOrEmpty()]
        [string]$Value
    )
    process {
        [System.Xml.Linq.XCData]$Value
    }
}

function XText {
    [CmdletBinding()]    
    param(
        [Parameter(Mandatory,Position=0)]
        [ValidateNotNullOrEmpty()]
        [string]$Value
    )
    process {
        [System.Xml.Linq.XText]$Value
    }
}

function XNamespace {
    [CmdletBinding()]
    param(
        [Parameter(Mandatory)]
        [VAlidateNotNUll()]
        [string]$Uri
    )
    process {
        [System.Xml.Linq.XNamespace]($Uri)
    }
}