How Selenium's ByChained class really works?

Question

I am very confused with what the documentation for ByChained class mentions. It says:

Mechanism used to locate elements within a docu

Answer 1

It's probably important to note (because I never see anyone mention this) that ByChained should be used just like any other By locator, like so:

driver.findElements( new ByChained(By.id("details"), By.className("personName")) )

or

driver.findElements( new ByAll(By.id("err1"), By.className("errBox")) )