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Special characters, such as &, #, |, and ?, should be avoided as they may also cause cross-platform issues and create problems when used in URLs.
I have read this as 'it is allowed' because it is not 'forbidden' - translation error ?
On the other hand this delimiter "&&" is only used inside an MPD file. So I do not expect problems with URLs. On Windows and Linux machines this does not break any filename.
Is there anything that I should have been aware of additional to the above mentioned?
I am not limited to this delimiter, but it seemed reasonably to me.