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The argument is a TeX number. Anything that would be accepted by \number is a valid argument: ⋅  explicite constants, ⋅  macros that expand to a number, ⋅  count registers, LaTeX counter can used via \value , e. g.: \alphalph{\value{page}} This means replace \renewcomm...

I would need, if possible, some clarification as to what the intended purposes of local public, local internal, global public, and public function are. I take it the difference between function and variable is clear? (This is mostly a semantic difference here as in TeX everything is a macro in the ...

Two undescores for internal, one for public TL's. Not only tokenlists but all kinds of variables, even functions. Public means that those variables and functions are allowed to be used by others and ideally are documented (just like all those in interface3). Internal functions and variables are not...

Such so-called “delimited” arguments would count as weird ( w ): \documentclass{article} \usepackage{xparse} \ExplSyntaxOn \cs_new_protected:Npn \mypackage_foo:ww #1|#2* { (#1)(#2) } \NewDocumentCommand \foo {u{|}u{*}} { \mypackage_foo:ww #1|#2* } \ExplSyntaxOff \begin{document} \foo...

No in TeX/LaTeX there is no namespace. This is part of the reason for the naming convention. The other reason is readability. After getting accustomed to the convention the code is far easier to read and understand than “traditional” (La)TeX code.

The first argument to \NewDocumentCommand can only be one command sequence token and not – like in your case – an instruction to build one. This means you have to build the command sequence token before passing it to \NewDocumentCommand . Also you are not following expl3 guidelines and naming conven...

Here is a suggestion: \documentclass{article} \usepackage{xparse} \ExplSyntaxOn \cs_new_protected:Nn \ewann_foo:n { \tl_if_empty:nTF {#1} {EMPTY} {(#1)} } \NewDocumentCommand \foo {g} { \IfNoValueTF {#1} { \ewann_foo:n {} } { \ewann_foo:n {#1} } } \ExplSyntaxOff \begin{document} \foo{c} % &#...

I would I rewrite this code inside a package (*.dtx) using expl3? \def\the@cartoon { Betty Boop } That depends. Is \the@cartoon going to be a tokenlist that is never going to change? Or may it be that its value (definition) changes (maybe depending on user settings)? % constant public variable: \tl...

Why not copy all exercises \begin{exercise} This is a good place to ask a question to test learning progress or further cement ideas into students' minds. \end{exercise} from your main document into a new document where you can use exercise or xsim or whatever to print the exercises and their so...

\NewDocumentCommand{\blah}{R<>{Jack} m}{#1~#2} defines a required (!) argument which of course means that an error message is given when the argument is missing. When LaTeX is compiled with interaction=nonstopmode (which is not unusual) the compilation doesn't stop at the error. This is where the d...