providing compliance with PDF/A instead of a tagged pdf

latex/document/Makefile

@@ -11,6 +11,6 @@ all: $(PDF)
 $(PDF): %.pdf: %.tex
 	$(TEXMK) $<
 
-EXTS = aux fdb_latexmk fls log nav out snm synctex.gz toc
+EXTS = aux fdb_latexmk fls log nav out snm synctex.gz toc xmpdata
 clean:
-	rm -rf $(PDF) _minted-$(NAME)/ $(foreach ext,$(EXTS),$(NAME).$(ext))
+	rm -rf $(PDF) _minted-$(NAME)/ $(foreach ext,$(EXTS),$(NAME).$(ext)) pdfa.xmpi

latex/document/document.tex

@@ -1,4 +1,14 @@
-\DocumentMetadata{testphase = {phase-III,math}}
+\newcommand{\settitle}{TITLE}
+\newcommand{\setauthor}{YOU}
+\newcommand{\setsubject}{SUBJECT}
+\newcommand{\setlocation}{LOCATION}
+\newcommand{\setmail}{mailto:place@holder.com}
+
+\begin{filecontents*}{\jobname.xmpdata}
+  \Title{\settitle}
+  \Author{\setauthor}
+  \Subject{\setsubject}
+\end{filecontents*}
 \documentclass{article}
 
 \usepackage[T1]{fontenc} % encoding
@@ -16,18 +26,8 @@
 % \usepackage{minted} % code integration
 % \usemintedstyle{emacs}
 
-\newcommand{\settitle}{TITLE}
-\newcommand{\setauthor}{YOU}
-\newcommand{\setsubject}{SUBJECT}
-\newcommand{\setlocation}{LOCATION}
-\newcommand{\setmail}{mailto:place@holder.com}
-
-\usepackage[
-  pdfauthor={\setauthor},   % author  metadata
-  pdftitle={\settitle},     % title   metadata
-  pdfsubject={\setsubject}, % subject metadata
-  hidelinks,                % clickable links in table of contents
-]{hyperref}
+\usepackage[a-3u]{pdfx}
+\hypersetup{hidelinks} % clickable links in table of contents
 
 \title{\settitle}
 \author{\href{\setmail}{\setauthor}\\\setsubject~$\cdot$ \setlocation}