add hyperxmp test

MANIFEST

@@ -984,6 +984,9 @@ t/complex/hyperchars.xml
 t/complex/hypertest.pdf
 t/complex/hypertest.tex
 t/complex/hypertest.xml
+t/complex/hyperxmp.pdf
+t/complex/hyperxmp.tex
+t/complex/hyperxmp.xml
 t/complex/labelled.pdf
 t/complex/labelled.tex
 t/complex/labelled.xml

t/80_complex.t

@@ -9,6 +9,7 @@ latexml_tests("t/complex",
     cleveref_minimal => 'cleveref.sty',
     figure_dual_caption => {packages => 'graphicx.sty', texlive_min => 2021},
     figure_mixed_content => {packages => 'graphicx.sty', texlive_min => 2021},
+    hyperxmp => 'babel.sty',
     si               => {
       env=>'CI', # only runs in continuous integration
       packages => 'siunitx.sty', texlive_min => 2015 } });

t/complex/hyperxmp.tex

@@ -0,0 +1,64 @@
+% example copied from hyperxmp with minor modifications
+\pdfobjcompresslevel=0 % added to easily inspect the XMP packet
+\documentclass[british]{article} % added british to test pdflang and pdfmetalang
+\usepackage[utf8]{inputenc}
+\usepackage{babel}
+\usepackage[unicode]{hyperref}
+\usepackage{hyperxmp}
+%
+\title{%
+  On a heuristic viewpoint concerning the production and
+  transformation of light}
+\author{Albert Einstein}
+\date{March 17, 1905}
+%
+\hypersetup{%
+  pdfmetalang={en-AU}, % added to test pdfmetalang
+  pdftitle={%
+    On a heuristic viewpoint concerning the production and
+    transformation of light},
+  pdfsubtitle={[en-US]Putting that bum Maxwell in his place},
+  pdfauthor={Albert Einstein},
+  pdfauthortitle={\xmpquote{Technical Assistant\xmpcomma\ Level III}},
+  pdfdate={1905-03-17},
+  pdfcopyright={Copyright (C) 1905, Albert Einstein},
+  pdfsubject={photoelectric effect},
+  pdfkeywords={energy quanta, Hertz effect, quantum physics},
+  pdflicenseurl={http://creativecommons.org/licenses/by-nc-nd/3.0/},
+  pdfcaptionwriter={Scott Pakin},
+  pdfcontactaddress={Kramgasse 49},
+  pdfcontactcity={Bern},
+  pdfcontactpostcode={3011},
+  pdfcontactcountry={Switzerland},
+  pdfcontactphone={031 312 00 91},
+  pdfcontactemail={aeinstein@ipi.ch},
+  pdfcontacturl={%
+    http://einstein.biz/,
+    https://www.facebook.com/AlbertEinstein
+  },
+  pdfdocumentid={uuid:6d1ac9ec-4ff2-515a-954b-648eeb4853b0},
+  pdfversionid={2.998e8},
+  pdfpublication={[de]Annalen der Physik},
+  pdfpublisher={Wiley-VCH},
+  pdfpubtype={journal},
+  pdfvolumenum={322},
+  pdfissuenum={6},
+  pdfpagerange={132-148},
+  pdfissn={0003-3804},
+  pdfeissn={1521-3889},
+  pdfpubstatus={VoR},
+  pdflang={en-GB},
+  pdfurl={http://www.physik.uni-augsburg.de/annalen/history/einstein-papers/1905_17_132-148.pdf},
+  pdfdoi={10.1002/andp.19053220607},
+  pdfidentifier={info:lccn/50013519}
+}
+\XMPLangAlt{de}{pdftitle={Über einen die Erzeugung und Verwandlung des
+  Lichtes betreffenden heuristischen Gesichtspunkt}}
+%
+\begin{document}
+\maketitle
+A profound formal difference exists between the theoretical
+concepts that physicists have formed about gases and other
+ponderable bodies, and Maxwell's theory of electromagnetic
+processes in so-called empty space\dots
+\end{document}

t/complex/hyperxmp.xml

@@ -0,0 +1,43 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<?latexml class="article" options="british"?>
+<?latexml package="inputenc" options="utf8"?>
+<?latexml package="babel"?>
+<?latexml package="hyperref" options="unicode"?>
+<?latexml package="hyperxmp"?>
+<?latexml RelaxNGSchema="LaTeXML"?>
+<document xmlns="http://dlmf.nist.gov/LaTeXML" class="ltx_authors_1line" prefix="cc: http://creativecommons.org/ns# dcterms: http://purl.org/dc/terms/ prism: http://prismstandard.org/namespaces/basic/3.0/" xml:lang="en-GB">
+  <resource src="LaTeXML.css" type="text/css"/>
+  <resource src="ltx-article.css" type="text/css"/>
+  <title>On a heuristic viewpoint concerning the production and
+transformation of light</title>
+  <creator role="author">
+    <personname>Albert Einstein</personname>
+  </creator>
+  <date role="creation">March 17, 1905</date>
+  <para xml:id="p1">
+    <p>A profound formal difference exists between the theoretical
+concepts that physicists have formed about gases and other
+ponderable bodies, and Maxwell’s theory of electromagnetic
+processes in so-called empty space…</p>
+  </para>
+  <rdf about="" content="Albert Einstein" property="dcterms:creator"/>
+  <rdf about="" content="Copyright (C) 1905, Albert Einstein" property="dcterms:rights" xml:lang="en-AU"/>
+  <rdf about="" content="1905-03-17" property="dcterms:date"/>
+  <rdf about="" content="10.1002/andp.19053220607" property="prism:doi"/>
+  <rdf about="" content="1521-3889" property="prism:eIssn"/>
+  <rdf about="" content="info:lccn/50013519" property="dcterms:identifier"/>
+  <rdf about="" content="0003-3804" property="prism:issn"/>
+  <rdf about="" content="6" property="prism:number"/>
+  <rdf about="" content="energy quanta, Hertz effect, quantum physics" property="dcterms:subject"/>
+  <rdf about="" content="en-GB" property="dcterms:language"/>
+  <rdf about="" property="cc:licence" resource="http://creativecommons.org/licenses/by-nc-nd/3.0/"/>
+  <rdf about="" content="132-148" property="prism:pageRange"/>
+  <rdf about="" content="Annalen der Physik" property="prism:publicationName" xml:lang="de"/>
+  <rdf about="" content="Wiley-VCH" property="dcterms:publisher"/>
+  <rdf about="" content="journal" property="prism:aggregationType"/>
+  <rdf about="" content="photoelectric effect" property="dcterms:description" xml:lang="en-AU"/>
+  <rdf about="" content="Putting that bum Maxwell in his place" property="prism:subtitle" xml:lang="en-US"/>
+  <rdf about="" content="On a heuristic viewpoint concerning the production and&#10;transformation of light" property="dcterms:title" xml:lang="en-AU"/>
+  <rdf about="" content="http://www.physik.uni-augsburg.de/annalen/history/einstein-papers/1905_17_132-148.pdf" property="prism:url"/>
+  <rdf about="" content="322" property="prism:volume"/>
+</document>