Add script to resave OGC conformance KML fixtures through lxml
Adds scripts/resave_kml_fixtures.py, which parses every .kml file under
tests/ogc_conformance/data/kml/ with lxml and writes it back in place. Run
once; the resulting diff is the expected lxml round-trip normalization
(single-quoted XML declaration, collapsed multi-line start-tag attributes,
tighter self-closing tags).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
