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</div>
<div class="section" id="overview">
<h2><a class="toc-backref" href="#id1">Overview</a></h2>
<p>A Locator allows for navigation in two or more dimensions. Locators are
N-dimensional iterators in spirit, but we use a different name because they
don&#8217;t satisfy all the requirements of iterators. For example, they don&#8217;t
supply increment and decrement operators because it is unclear which dimension
the operators should advance along.
N-dimensional locators model the following concept:</p>
<di