ABSOLUTE MAXIMUM RATINGS of ADG884 INx pin

I'm DFAE in Japan. My customer asked me what are meanings of ABSOLUTE MAXIMUM RATINGS in the datasheet of ADG884.

ABSOLUTE MAXIMUM RATINGS of ADG884 are described as follows.

Analog Inputs,(1) Digital Inputs −0.3 V to VDD + 0.3 V or 30 mA (whichever occurs first)

(1)Overvoltages at IN, S, or D pins are clamped by internal diodes. Current should be limited to the maximum ratings given.

When my customer measured I-V between INx and VDD, he could NOT find diode characteristics in ±1V.

Does INx pin has the protection diode between INx and VDD?

Or INx pin have clamp diode between INx and GND to clamp INx voltage?