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\section{Basic Macros}  As mentioned above, only definitions placed in \verb|header.tex| are global for your entire article. You can use all flavors of \TeX's definitions (\verb|\def|, \verb|\edef|, \verb|\xdef|, \verb|\gdef|, \verb|\newcommand|, \verb|\rewnewcommand|, ...) to your liking.  If you want to discuss a notable entity, \textbf{term},  such as \latexml, you may want to define a handy macro which: \begin{enumerate}  \item Links to the entity's term's  Wikipedia page \item Is available in your entire document (define it in \verb|header.tex|)  \item Flexibly figures out if it needs a trailing space or not\footnote{one of \TeX's original weaknesses with its macros}  \item Is easier to write than the entity's term's  full name \end{enumerate}  Here is one way you can achieve that, with the entities used in this tutorial: