The pdf:Trapped flag

[devds96]

The Trapped flag can be set as seen in this example:

\DocumentMetadata{
  pdfstandard = {X-4},
  lang = en-US,
  pdfversion = 1.7,
  colorprofiles = { X = FOGRA39L_coated.icc }
}

\documentclass[a4paper]{article}

\ExplSyntaxOn
\pdfmeta_xmp_add:n{<pdf:Trapped>True</pdf:Trapped>}
\pdfmanagement_add:nnn{Info}{Trapped}{/True}
\ExplSyntaxOff

\begin{document} test \end{document}

However, this still requires an extension schema for this flag.

Reference: https://tex.stackexchange.com/questions/757985

[u-fischer]

You can declare the schema and the property like this:

\DocumentMetadata{
  pdfstandard = {X-4},
  lang = en-US,
  pdfversion = 1.7,
  colorprofiles = { X = FOGRA39L_coated.icc }
}

\documentclass[a4paper]{article}
\ExplSyntaxOn
\pdfmeta_xmp_schema_new:nnn{Adobe~PDF~Schema}{pdf}{http://ns.adobe.com/pdf/1.3/}
\pdfmeta_xmp_property_new:nnnnn{pdf}{Trapped}{Text}{internal}
 {Indication~if~the~document~has~been~modified~to~include~trapping~ information}
\pdfmeta_xmp_add:n{<pdf:Trapped>True</pdf:Trapped>}
\pdfmanagement_add:nnn{Info}{Trapped}{/True}
\ExplSyntaxOff


\begin{document} test \end{document}