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The Path syntax is used by (for example) sort, and is used to define a path.

Usage example (using Set::sort()):

$a = array(
	0 => array('Person' => array('name' => 'Jeff')),
	1 => array('Shirt' => array('color' => 'black'))
);
$result = Set::sort($a, '{n}.Person.name', 'asc');
/* $result now looks like: 
	Array
	(
	    [0] => Array
	        (
	            [Shirt] => Array
	                (
	                    [color] => black
	                )
	        )
	    [1] => Array
	        (
	            [Person] => Array
	                (
	                    [name] => Jeff
	                )
	        )
	)
*/

1. $a = array(
2. 0 => array('Person' => array('name' => 'Jeff')),
3. 1 => array('Shirt' => array('color' => 'black'))
4. );
5. $result = Set::sort($a, '{n}.Person.name', 'asc');
6. /* $result now looks like:
7. Array
8. (
9. [0] => Array
10. (
11. [Shirt] => Array
12. (
13. [color] => black
14. )
15. )
16. [1] => Array
17. (
18. [Person] => Array
19. (
20. [name] => Jeff
21. )
22. )
23. )
24. */

As you can see in the example above, some things are wrapped in {}'s, others not. In the table below, you can see which options are available.