param([string]$webUrl="http://fdi-sp2013-1:2921/en",
[string]$listUrl="Lists/MBDAPracticalInformation",
[string]$contentTypeName,
[boolean]$includeHiddenFields=$true,
[string]$excludeTypes="Computed;Lookup;Guid"
)
clear
Add-PSSnapin Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue 
Push-Location

function AddType($typeAsString)
{
    $types = $excludeTypes.Split(";");
    return $types.Contains($typeAsString) -eq $true;
}
function AddField($field)
{
    <##>
    if(AddType($field.TypeAsString) -eq $false)
    {
        return;
    }
    
    $fields = $script:exportNode.SelectSingleNode("/List/Fields");
    [System.XML.XMLElement]$oXMLField=$global:exportNode.CreateElement("Field");
    #InternalName
    $urlAt = $global:exportNode.CreateAttribute("InternalName");
    $urlAt.Value = $field.InternalName;
    $oXMLField.Attributes.Append($urlAt);
    $fields.AppendChild($oXMLField);
    #Title
    $urlAt = $global:exportNode.CreateAttribute("Title");
    $urlAt.Value = $field.Title;
    $oXMLField.Attributes.Append($urlAt);
    $fields.AppendChild($oXMLField);
    #TypeAsString
    $urlAt = $global:exportNode.CreateAttribute("TypeAsString");
    $urlAt.Value = $field.TypeAsString;
    $oXMLField.Attributes.Append($urlAt);
    $fields.AppendChild($oXMLField);
    #Hidden
    $urlAt = $global:exportNode.CreateAttribute("Hidden");
    $urlAt.Value = $field.Hidden;
    $oXMLField.Attributes.Append($urlAt);
    $fields.AppendChild($oXMLField);
    #Required
    $urlAt = $global:exportNode.CreateAttribute("Required");
    $urlAt.Value = $field.Required;
    $oXMLField.Attributes.Append($urlAt);   
    #Group
    $urlAt = $global:exportNode.CreateAttribute("Group");
    $urlAt.Value = $field.Group;
    $oXMLField.Attributes.Append($urlAt);
    $fields.AppendChild($oXMLField);
    <# #>
}

$web = Get-SPWeb $webUrl -ErrorAction:SilentlyContinue;
if($web -eq $null)
{
    read-Host "cannot access to $($webUrl) push any key to exit"
    exit 0;
}
Write-Host "connected to $($webUrl) Title $($web.Title)"

$list = $web.GetList([Microsoft.Sharepoint.Utilities.SPUtility]::ConcatUrls($web.ServerRelativeUrl, $listUrl));
Write-Host "list $($list.Title) loaded"

#create xml document
$global:exportNode = New-Object System.Xml.XmlDocument

#add list node
[System.XML.XMLElement]$oXMLRoot=$global:exportNode.CreateElement("List")


#web Url attribute
$urlAt = $global:exportNode.CreateAttribute("url");
$urlAt.Value = $webUrl;
$oXMLRoot.Attributes.Append($urlAt);

#web title attribute
$urlAt = $global:exportNode.CreateAttribute("webTitle");
$urlAt.Value = $web.Title;
$oXMLRoot.Attributes.Append($urlAt);

#List Title attribute
$urlAt = $global:exportNode.CreateAttribute("ListTitle");
$urlAt.Value = $list.Title;
$oXMLRoot.Attributes.Append($urlAt);

#List Url attribute
$urlAt = $global:exportNode.CreateAttribute("ListUrl");
$urlAt.Value = $listUrl;
$oXMLRoot.Attributes.Append($urlAt);

#add list note to xmlDocument
$global:exportNode.appendChild($oXMLRoot);

$fields = $null;

if($includeHiddenFields)
{
    $fields = $list.Fields |Sort-Object{$_.InternalName} | select Title, InternalName, TypeAsString, Hidden, Required, Group
}
else
{    
    $fields = $list.Fields |Sort-Object{$_.InternalName} | Where-Object {$_.Hidden -eq $false} | select Title, InternalName, TypeAsString, Hidden, Required, Group
}

#add fields
[System.XML.XMLElement]$oXMLFields=$global:exportNode.CreateElement("Fields")
$global:exportNode.FirstChild.AppendChild($oXMLFields);
foreach($field in $fields){
    AddField($field);
}

#add ContentTypes
[System.XML.XMLElement]$oXMLContentTypes=$global:exportNode.CreateElement("ContentTypes")
$global:exportNode.FirstChild.AppendChild($oXMLContentTypes);

$oXMLContentTypes = $script:exportNode.SelectSingleNode("/List/ContentTypes");

foreach($contentType in $list.ContentTypes)
{
    [System.XML.XMLElement]$oXMLContentType=$global:exportNode.CreateElement("ContentType");
    $urlAt = $global:exportNode.CreateAttribute("Name");
    $urlAt.Value = $contentType.Name;
    $oXMLContentType.Attributes.Append($urlAt);
    
    $oXMLContentTypes.AppendChild($oXMLContentType);

    
    [System.XML.XMLElement]$oXMLCTFields=$global:exportNode.CreateElement("Fields");
    $oXMLContentType.AppendChild($oXMLCTFields);
    <##>
    if($includeHiddenFields)
    {
        $fields = $contentType.Fields |Sort-Object{$_.InternalName} | select Title, InternalName, TypeAsString, Hidden, Required, Group
    }
    else
    {    
        $fields = $contentType.Fields |Sort-Object{$_.InternalName} | Where-Object {$_.Hidden -eq $false} | select Title, InternalName, TypeAsString, Hidden, Required, Group
    }
    

    #fields in content type
    foreach($field in $fields)
    {
        [System.XML.XMLElement]$oXMLCTField=$global:exportNode.CreateElement("Field");
        #InternalName
        $urlAt = $global:exportNode.CreateAttribute("InternalName");
        $urlAt.Value = $field.InternalName;
        $oXMLCTField.Attributes.Append($urlAt);
        #Title
        $urlAt = $global:exportNode.CreateAttribute("Title");
        $urlAt.Value = $field.Title;
        $oXMLCTField.Attributes.Append($urlAt);
        #TypeAsString
        $urlAt = $global:exportNode.CreateAttribute("TypeAsString");
        $urlAt.Value = $field.TypeAsString;
        $oXMLCTField.Attributes.Append($urlAt);
        #Hidden
        $urlAt = $global:exportNode.CreateAttribute("Hidden");
        $urlAt.Value = $field.Hidden;
        $oXMLCTField.Attributes.Append($urlAt);
        #Required
        $urlAt = $global:exportNode.CreateAttribute("Required");
        $urlAt.Value = $field.Required;
        $oXMLCTField.Attributes.Append($urlAt);   
        #Group
        $urlAt = $global:exportNode.CreateAttribute("Group");
        $urlAt.Value = $field.Group;
        $oXMLCTField.Attributes.Append($urlAt);

        $oXMLCTFields.AppendChild($oXMLCTField);

    }
    
    
}
<# #>
#export to test file
$global:exportNode.OuterXml | Out-File "$($list.Title.Replace(" ", "_")).xml" -Encoding utf8

#dispose the web
$web.Dispose()