Select-Xml

PS C:\>  $Path = "$Pshome\Types.ps1xml"
PS C:\> $XPath = "/Types/Type/Members/AliasProperty"
PS C:\> Select-Xml -Path $Path -XPath $Xpath | Select-Object -ExpandProperty Node

   Name                 ReferencedMemberName
   ----                 --------------------
   Count                Length
   Name                 Key
   Name                 ServiceName
   RequiredServices     ServicesDependedOn
   ProcessName          Name
   Handles              Handlecount
   VM                   VirtualSize
   WS                   WorkingSetSize
   Name                 ProcessName
   Handles              Handlecount
   VM                   VirtualMemorySize
   WS                   WorkingSet
   PM                   PagedMemorySize
   NPM                  NonpagedSystemMemorySize
   Name                 __Class
   Namespace            ModuleName

PS C:\> [xml]$Types = Get-Content $Pshome\Types.ps1xml
PS C:\> Select-Xml -Xml $Types -XPath "//MethodName"

1. The second command saves the path to the help files in the $Path variable.If there are no help files in this path on your computer, use the Update-Help cmdlet to download the help files:

   PS C:\> $Namespace = @{command = "http://schemas.microsoft.com/maml/dev/command/2004/10"; maml = "http://schemas.microsoft.com/maml/2004/10"; dev = "http://schemas.microsoft.com/maml/dev/2004/10"}
   
   PS C:\> $Path = "$Pshome\en-us\*dll-Help.xml"
   

   For more information about Updatable Help, see about_Updatable_Help (http://go.microsoft.com/fwlink/?LinkId=235801).

2. The third command uses the **Select-Xml** cmdlet to search the XML for cmdlet names by finding Command:Name element anywhere in the files:

   PS C:\> $Xml = Select-Xml -Path $Path -Namespace $Namespace -XPath "//command:name"
   

   It saves the results in the $Xml variable.**Select-Xml** returns a **SelectXmlInfo** object that has a Node property, which is a **System.Xml.XmlElement** object. The Node property has an InnerXML property, which contains the actual XML that is retrieved.

3. The fourth command sends the XML in the $Xml variable to the Format-Table cmdlet:

   PS C:\> $Xml | Format-Table @{Label="Name"; Expression= {($_.node.innerxml).trim()}}, Path -AutoSize
   
      Name                    Path
      ----                    ----
      Export-Counter          
      C:\Windows\system32\WindowsPowerShell\v1.0\en-us\Microsoft.PowerShell.Commands.Diagnostics.dll-Help.xml
      Get-Counter             
      C:\Windows\system32\WindowsPowerShell\v1.0\en-us\Microsoft.PowerShell.Commands.Diagnostics.dll-Help.xml
      Get-WinEvent            
      C:\Windows\system32\WindowsPowerShell\v1.0\en-us\Microsoft.PowerShell.Commands.Diagnostics.dll-Help.xml
      Import-Counter          
      C:\Windows\system32\WindowsPowerShell\v1.0\en-us\Microsoft.PowerShell.Commands.Diagnostics.dll-Help.xml
      Add-Computer            
      C:\Windows\system32\WindowsPowerShell\v1.0\en-us\Microsoft.PowerShell.Commands.Management.dll-Help.xml
      Add-Content             
      C:\Windows\system32\WindowsPowerShell\v1.0\en-us\Microsoft.PowerShell.Commands.Management.dll-Help.xml
      Checkpoint-Computer     
      C:\Windows\system32\WindowsPowerShell\v1.0\en-us\Microsoft.PowerShell.Commands.Management.dll-Help.xml
      ...

   The **Format-Table** command uses a calculated property to get the Node.InnerXML property of each object in the $Xml variable, trim the white space before and after the text, and display it in the table, along with the path to the source file.This example shows how to use the Select-Xml cmdlet to search the Windows PowerShell XML-based cmdlet help files. In this example, we'll search for the cmdlet name that serves as a title for each help file and the path to the help file.

   The first command creates a hash table that represents the XML namespace that is used for the help files and saves it in the $Namespace variable.

1. The second command uses the *Content* parameter of **Select-Xml** to specify the XML in the $Xml variable.:

   PS C:\> $Xml = @"
   <?xml version="1.0" encoding="utf-8"?>
   <Book>
   
        <projects>
          <project name="Book1" date="2009-01-20">
            <editions>
              <edition language="English">En.Book1.com</edition>
              <edition language="German">Ge.Book1.Com</edition>
              <edition language="French">Fr.Book1.com</edition>
              <edition language="Polish">Pl.Book1.com</edition>
            </editions>
          </project>
        </projects>
      </Book>
      "@
   PS C:\> Select-Xml -Content $Xml -XPath "//edition" | foreach {$_.node.InnerXML}
   
      En.Book1.com
      Ge.Book1.Com
      Fr.Book1.com
      Pl.Book1.com

   The second command uses the *Content* parameter of **Select-Xml** to specify the XML in the $Xml variable.

2. The third command is equivalent to the second:

   PS C:\> $Xml | Select-Xml -XPath "//edition" | foreach {$_.node.InnerXML}
   
      En.Book1.com
      Ge.Book1.Com
      Fr.Book1.com
      Pl.Book1.com

   It uses a pipeline operator (|) to send the XML in the $Xml variable to the **Select-Xml** cmdlet.This example shows two different ways to send XML to the Select-Xml cmdlet.

   The first command saves a here-string that contains XML in the $Xml variable. (For more information about here-strings, see about_Quoting_Rules.)

PS C:\> $SnippetNamespace = @{snip = "http://schemas.microsoft.com/PowerShell/Snippets"}

PS C:\> Select-Xml -Path $Home\Documents\WindowsPowerShell\Snippets -Namespace $SnippetNamespace -XPath "//snip:Title" | foreach {$_.Node.Innerxml}