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- ARB: a Short Introduction
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# TAGS: Subfields

- OCCURRENCE
- DESCRIPTION
- NOTES
- EXAMPLES
- BUGS

## OCCURRENCE

### ARB_NT: Merge Tools / Modify Database Fields

## DESCRIPTION

    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'

## NOTES

### The Modify Database Fields tools allows to modify only single subfields. If there are no tags used yet, the default tag is taken.

## EXAMPLES

### None

## BUGS

### Square Brackets in the fields are replaces by '{}'