update setup and tests, compile XPath expressions

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (0faec09) 99.08% compared to head (9e8b560) 99.09%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #136 +/- ## ======================================= Coverage 99.08% 99.09% ======================================= Files 8 8 Lines 878 880 +2 ======================================= + Hits 870 872 +2 Misses 8 8 ```

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