errors trying to add new variables to template

[Hugh Esco <hresco3-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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My client wants me to create pdfs from articles extracted from the 
internet.  

I am able to successfully use yaml at the top of a markdown document 
extracted from the html to define the title, author and date.  But it fails 
to render the subtitle, or institute  in the pdf.  Also the abstract, if 
defined in the yaml, shows up in the two-column body of the result file, 
rather than in the one column header of the result file.  

Any attempts to add support to the template (copied to ~/.pandoc/templates/ 
and invoked from the command line as --template=copied-template-name.latex) 
are failing for yaml defined variables url and publication, including 
variations on those names, in case those happen to be reserved keywords.  

```
$ diff -u /usr/share/pandoc/data/templates/default.latex 
~/.pandoc/templates/default-2col-3.latex
--- /usr/share/pandoc/data/templates/default.latex    2018-01-26 
07:52:22.000000000 -0500
+++ /home/hesco/.pandoc/templates/default-2col-3.latex    2021-08-11 
14:03:34.846709357 -0400
@@ -220,6 +220,7 @@
 \institute{$for(institute)$$institute$$sep$ \and $endfor$}
 $endif$
 \date{$date$}
+$url_for_article$
 
 \begin{document}
 $if(title)$
```

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