<http://schema.org/description>
"&lt;p&gt;Almost all current model machining center controls use fixture offsets for program zero assignment.  With most, the distance from the machine's reference position (commonly called the zero return position) to the program zero point must be determined for each axis. &lt;/p&gt;"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mmsonline.com/columns/the-point-of-reference-for-fixture-offset-entries>