This will work in header-includes in your document's metadata, but not in header-includes in the metadata section of a defaults file file. The reason is that, as documented, values passed to --metadata are parsed as plain text, while metadata in a markdown file is parsed as markdown.

You could try 

variables:

  header-includes:

    - \usepackage{tikzsymbols}

Variable text is passed through unchanged (so no escaping).

On Jul 3, 2023, at 1:46 AM, Oliver <news-WPTjrydoUPgeaOpM6FAJmQkbCANdLtlA@public.gmane.org> wrote:

Hi there

In a markdown document I can add for the LaTeX writer the following in the YAML metadata blocK:

---
header-includes:
  - \usepackage{tikzsymbols}
...

Then I can use in the document things like \Cooley[-3][cyan] and more. :-)

However I was not able to add this \usepackage declaration to a defaults file. I tried in my defaults file myarticle.yaml the following:

from: markdown+raw_attribute
metadata:
  documentclass: scrartcl
  header-includes:
    - \usepackage{tikzsymbols}

but then I get the Latex error:

! LaTeX Error: Missing \begin{document}.
[...]
l.46 \textbackslash

Somehow the \usepackage{tikzsymbols} command is now „escaped“ so that the backslash get printed out... How can I avoid this and give the \usepackage declaration in the defaults file?

Thanks for any pointers!

Oliver

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