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Good to know!
If you wanted want to add two or more tags from different tag groups, for example:
Tag Group1: Boolean → Tag: TRUE;
Tag Group2: CommType → Tag: GuestComm.
You you then have to replace all <tuv xml:lang="en-GB">
occurrences with <prop type="Boolean">TRUE</prop><prop type="CommType">GuestComm</prop><tuv xml:lang="en-GB">
.