Koha/etc/zebradb/retrieval-info-auth-dom.xml

<?xml version="1.0" encoding="UTF-8"?>
<retrievalinfo xmlns="http://indexdata.com/yaz">
  <retrieval syntax="__ZEBRA_MARC_FORMAT__" name="F">
    <backend syntax="xml" name="marc">
      <marc inputformat="xml" outputformat="marc"
            inputcharset="utf-8"
            outputcharset="utf-8"/>
    </backend>
  </retrieval>
  <retrieval syntax="__ZEBRA_MARC_FORMAT__" name="B">
    <backend syntax="xml" name="marc">
      <marc inputformat="xml" outputformat="marc"
            inputcharset="utf-8"
            outputcharset="utf-8"/>
    </backend>
  </retrieval>
  <retrieval syntax="xml"/>
</retrievalinfo>