NSError *error = nil;
CSURITemplate *template = [CSURITemplate URITemplateWithString:@"{?list*}"
                                                         error:&error];
NSDictionary *variables = @{@"list": @[@"red", @"green", @"blue"]};
NSString *uri = [template relativeStringWithVariables:variables error:&error];
assert([uri isEqualToString:@"?list=red&list=green&list=blue"]);

NSURL *baseURL = [NSURL URLWithString:@"http://www.example.com"];
NSURL *URL = [template URLWithVariables:variables relativeeToURL:baseURL error:&error];
assert([uri isEqualToString:@"http://www.example.com?list=red&list=green&list=blue"]);