Pn, where n is an integer, indicates the nth page in the survey. For example P2 references the 2nd page in the survey

PnQr, where n and r are integers, indicates the rth question in the nth page in the survey. For example, P2Q3 references the 3rd question in the 2nd page in the survey.

PnEr, where n and r are integers, has the same meaning as PnQr (see above) with the difference that the reference is to a presentation element rather than to a question.

Qr the rth question within a page or a library

Er the rth presentation element within a page or a library