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I am currently in the process of modifying one biblatex style to conform to another, and that includes adding a new datatype. I have added the code below to my style.bbx

\DeclareFieldFormat[datatype]{title}{{#1}\addperiod}
\DeclareFieldFormat[datatype]{foo}{{#1}\addperiod}
\DeclareFieldFormat[datatype]{bar}{#1}

When using \DeclareBibliographyDriver{datatype}, \printfield{title} is the only one that prints anything. \printfield{foo} and \printfield{bar} do not produce anything.

Changing foo to another field already in use (such as journaltitle) seems to work, but I'd like to avoid a hacky solution like that if possible.

user199737
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    If you want a new data type with new fields you need to declare the new fields/type in a data model file. See https://tex.stackexchange.com/q/175776/35864 (which would be a good duplicate) and https://tex.stackexchange.com/q/163303/35864 (for a few alternatives). – moewe Oct 20 '19 at 10:28
  • @moewe Thank you so much, this has ended a few months of confusion. I ended up referring to the second one and mapping fields to existing ones. – user199737 Oct 20 '19 at 12:16
  • OK, do you think we can close this as a duplicate of https://tex.stackexchange.com/q/163303/35864 then? – moewe Oct 20 '19 at 14:17
  • Yes, that should be fine. – user199737 Oct 21 '19 at 14:29

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