Daimler Truck Holding AG Equity – DE000DTR0CK8
In terms of Xetra, this is just an electronic trading platform as opposed to an actual physical stocks exchange. So the vast majority of trades on the various German stock exchanges are processed through Xetra. The links below provides a decent summary/overview.
So you won’t find a share that is just listed/traded on Xetra. If you look at the example below (see link for Daimler), these are common shares listed on the main (regulated) market of the Frankfurt Stock Exchange (thereby qualifying for ISA inclusion) but the trading takes place through Xetra. So, in some ways, you could say that the Xetra element of the trading is irrelevant for ISA purposes. It is the actual listing on the Frankfurt Stock Exchange that is key.
Xetra: What it is, Comparison to Other Trading Systems (investopedia.com)
Xetra (trading system) – Wikipedia
Daimler Truck Holding AG Equity | DTR0CK | DE000DTR0CK8 | Share Price (boerse-frankfurt.de)