Initialize a Biber::Output::bbl object
Create the output for misc bits and pieces like preamble and closing macro call and add to output object.
Add the .bbl for a text field to the output accumulator.
Set the output for a key which is an alias to another key
Set the .bbl output for an undefined key
Set the .bbl output for an entry. This is the meat of the .bbl output
BBL output method - this takes care to output entries in the explicit order derived from the virtual order of the citekeys after sortkey sorting.
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