Code
unpack_xml(df, .data$pp_xml, unpack_formula)
Output
# A tibble: 4 x 4
feed_id contest_name pp_id pp_name
<chr> <chr> <chr> <chr>
1 101 Contest 1 PP1 Polling Place 1
2 101 Contest 1 PP2 Polling Place 2
3 101 Contest 2 PP3 Polling Place 3
4 101 Contest 2 PP4 Polling Place 4
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