<h3>bounds function</h3>
Returns a geometry which represents the bounding box of an input geometry. Calculations are in the Spatial Reference System of this Geometry. 

<h4>Syntax</h4>
<pre>bounds(geom)</pre>

<h4>Arguments</h4>
geom &rarr; a geometry

<h4>Example</h4>
<pre> bounds($geometry) &rarr; returns bounding box of $geometry</pre>

