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This PowerShell query breaks, if the item name contains query operators such as "and" or "child". How should I escape it, so that they don't break it?
$SourceItemPath = $SourceItem.Paths.path
$SourceAncestorItem = Get-Item -Path "master:" -Query "$SourceItemPath/ancestor-or-self::*[@@templatekey='my template key']"
In Sitecore Query, you escape keywords and whitespaces by surrounding path parts with hashes.
To make your query work, prepare the path like this:
$SourceItemPath = $SourceItemPath -replace '[^/]*(and|or|child|descendant|\s)[^/]*','#$&#'
This will convert /some/path/bla and bla/something to /some/path/#bla and bla#/something
# #. This would likely be an issue with the Sitecore API rather than SPE, consider verifying with documentation supporting the query format.