get_dots_or_list

Get input from dots or list, but not both.
Throws an error if both are supplied.

internal

A set of tools for parsing, manipulating, and graphing data
classified by a hierarchy (e.g. a taxonomy).

<dl><dt>...</dt>
<dd>Dots input</dd>
<dt>.list</dt>
<dd>List input</dd></dl>

<dl>

<dt>...</dt>
<dd>Dots input</dd>


<dt>.list</dt>
<dd>List input</dd>

</dl>