501 - sgml/signature GitHub Wiki https://www.nten.org/article/your-technology-problem-is-actually-a-people-problem/ https://www.nten.org/ntc/program/past-ntcs/19ntc-agenda/ https://www.ukaop.org/ask-the-associate/seven-common-pitfalls-digital-publishers-face-when-shifting-their-focus-to-first-party-data