Tags are used to subdivide fields into subfields, which
often have the same value. E.g. After merging the 16s databases
from RDP and DeWachter all species have two full_names:
The RDP and DeWachter version which should be equal but which
are often not. So we 'TAG' the dewachter database using the
tag 'DEW' and the RDP with the tag 'RDP'. Say one species has
the full_names escherichia_RDP and escherichia_DEW.
Using the tags mechanism the final field will look like this:
' [DEW] escherichia_DEW [RDP] escherichia_RDP'.
Tags are sourrounded by brackets and put in front of the
corresponding field value. If both subfields have the same
value, (like escherichia_coli) fields are merged:
' [DEW,RDP] escherichia_coli'
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