RussCan said:
You mentioned they might explicitly define physical presence.......is not it already clearly defined as 1095 days in the preceding 4 years period?
Residence is not defined in the Citizenship Act. Judges currently have the choice between applying any of three different legal tests to approve or deny citizenship. All are considered legitimate, but they are all different. So two applicants with identical applications could have varying outcomes of a judge's hearing depending upon which test was applied.
1. Re: Poughasemi [1993] Strict physical presence test (1095 days),
2. Re: Papadogiorgakis [1978] Pied à terre, "clear intention" to live in Canada,
3. Re: Koo [1993] "Centralized mode of existence" test, where the applicant “regularly, normally, or customarily lives.”)
Some applicants who have been denied under the physical presence test have appealed that the Koo test should have been applied, but I don't believe they were successful. Currently, the judge has wide discretion as to how to define "residence".
There's some other important cases, notably Re: Takla. You can read more about the issue here:
http://immigrationlawbc.com/news/page/3/ (scroll down a bit)