How to parse delete-property annotations

[ In the context of Emacs's dts-mode (http://elpa.gnu.org/packages/dts-mode). ]

I recently came across the following piece of DTS code:

   &usbphy {
        /* Unset otg detect pins as we force dr_mode */
        /delete-property/ usb0_id_det-gpio;
        /delete-property/ usb0_vbus_det-gpio;
   };

and was wondering how dts-mode should understand this.  `dts-mode'
doesn't try to understand the actual *meaning* of such code, but it does
try to understand the syntax (i.e. how the abstract-syntax-tree would
look like).

Is "/delete-property/" is special syntax in itself, or is it a special
case of a more general syntax (like "/.../ blabla;")?  Where exactly is
it allowed to appear?
Could someone point me to some documentation explaining/describing this syntax?


        Stefan
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