[IDEA] Creating a cfg-file for a department

The aim is to have one .cfg-file for each department. In this department all things are defined that are e.g. not person specific. The .cfg-file should be applicable to letter, beamer and poster.

Here is an approach. However as far as I see in the rwth-letter.sty there is no \c__ptxcd_base_str filled. (cf. https://gitlab.git.nrw/rwth-it-center/rwth-latex-templates/rwth-ci/-/blame/main/tex/rwth-ci.dtx?ref_type=heads#L209)

\ProvidesFile{rwth-itcenter.cfg}[2026-11-15 Common information about IT Center]

 \ExplSyntaxOn
 \str_if_in:NnT \c__ptxcd_base_str {letter}
 {
 %------------------ letter
 \setkomavar{frominstitution-short}{MYINSTITUT}
 \setkomavar{frominstitution-id}{010420}
 \setkomavar{fromaddress}{Musterstraße 7\\52074 Aachen\\GERMANY}
 \setkomavar{fromurl}{https://mi.rwth-aachen.de/}
 \setkomavar{fromvat}{DE\,121\,689\,807}
 \setkomavar{fromtax}{201/5930/5005}

 \setkomavar*{frombank}{RWTH Aachen University}
 \setkomavar{frombank}{
 Kontoinhaber\\
 Name der Bank\\
 Konto 000\,000\,000\\% optional
 BLZ 000\,000\,00\\% optional
 SWIFT-BIC: ABCDEF1\\
 IBAN:  DE00\,0000\,0000\,0000\,0000\,00
 }
 %--------------- letter end
}

 \str_if_in:NnT \c__ptxcd_base_str {beamer}
 {
 %------------------ beamer
 %....
 }
 \ExplSyntaxOff