What are the possible values ​​for &sortdir in pdoResources(ModX)?

Question

MODX

In the description for pdoResources, there is a &sortdir item and the standard value is indicated there, but there is no link to the rest.
Where can I find them, or how are they compiled?

Answer 1

& sortby use, there you can get out as you like)

Answer 2

DESC and ASC