2
Remove special characters like ’ from key name:
\documentclass{book}
\usepackage{tikz}
\usepackage{parskip}
\begin{document}
\tikzset{Karls grid/.style={help lines,color=blue!50}}
\begin{tikzpicture}
\draw[Karls grid] (-5,-5) grid (5,5);
\end{tikzpicture}
\end{document}
2
One way to approach this issue is to do a 'dry run' of \ExecuteMetaData, i.e., run a modified version of the command that stores the code between the tags in a macro and test if this macro is empty. If that is the case you can issue an error message. After the dry run you should do a 'real' run with the original version of \ExecuteMetaData. It would be nice ...
1
Here is a way:
main.tex:
\documentclass{article}
\usepackage{lipsum}
\usepackage{pgffor}
%Add the files you wish to be included here:
\def\onlyinput{main1,main2}
%Command definition
\newcommand{\minput}[1]{\def\xx{#1}\foreach \x in \onlyinput{\ifx\x\xx\input{#1}\fi}}
\begin{document}
\section{Standard Section}
\lipsum[1]
\minput{main1}
\minput{main2}...
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