How to read values from XML file and pass the values as a comma seperated string to exclude parameter in powershell ?

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PowerShell

I have xml file which contains names of few files. I want to read those file names and pass it as a comma seperated string to Exclude command in power shell.

What I have tried:

I have xml file which contains names of few files.
I am using below command to delete files from \\Test\abc location. However, while deleting files, I don't want to delete those files which contains "abc" or "xyz" in their file name.

In future, I may need to exclude the files which has "pqr" (say) in their file name. So instead of hard coding it in below command, I need to include all those words in xml file. I will read that xml file and pass those names as comma seperated string as a parameter to "Exclude" in below command.

Get-ChildItem –Path "\\Test\abc" -Exclude *abc*,*xyz* -Recurse | Where-Object {$_.LastWriteTime -lt (Get-Date).AddDays(-4)} | Remove-Item

Please let me know how I can read the xml file and pass the values as a comma seperated string to Exclude command ?