Assertion:
It is undefined in the specification what should happen if more than two RTC elements exist in a complex RUBY element.

Complex RUBY element, Single RTC group:
filler text http:// www.blooberry.com /directory/file.htm Protocol Hostname Path filler text

Complex RUBY element, Two RTC groups. Group 1 uses "["/"]" to delimit, and Group 2 uses "^"/"^" to delimit:
filler text http:// www.blooberry.com /directory/file.htm [Uniform Resource Locator] ^Protocol^ ^Hostname^ ^Path^ filler text

Complex RUBY element, Three RTC groups. Group 1 uses "["/"]" to delimit, Group 2 uses "^"/"^" to delimit, and Group 3 uses "*"/"*" to delimit:
filler text http:// www.blooberry.com /directory/file.htm [Spanning RTC1] ^RTC2-p1^ ^RTC2-p2^ ^RTC2-p3^ *RTC3-p1* *RTC3-p2* *RTC3-p3* filler text