citation:

  * lint-check bibliography
    `biber --validate-datamodel --tool ref.bib`
    `bibtool -o '' ref.bib`
  * maybe include website title by abusing biblatex field "etype"
    <https://github.com/plk/biblatex-apa/issues/154#issuecomment-1027664481>
  * avoid discouraged biblatex entry type "misc"
  * structure appendices according to APA style guide
    <https://penandthepad.com/add-addendum-apa-format-3512.html>
  * maybe lint-check ref.bib using biber
    `biber --validate-datamodel --tool ref.bib`

auxiliary metadata:

  * generate PDF/A compliant PDF files
    <https://www.aalto.fi/en/services/creating-a-pdfa-compliant-file-of-your-thesis>
    <https://tex.stackexchange.com/a/655531/309738>
  * maybe tweak PDF tagging
    <https://ctan.org/pkg/tagpdf>
    <https://tex.stackexchange.com/a/609329/309738>
  * validate generated PDF
    * https://www.pdf-online.com/osa/validate.aspx
    * https://demo.verapdf.org/
  * maybe enable more DocumentMetadata options
    <https://tex.stackexchange.com/a/686905/309738>
  * maybe document revived XMP ontologies somewhere
    <https://stackoverflow.com/a/73730400/18619283>