Hello,
Go with the substring solution…
type geopint: Space-separated list of valid latitude (decimal degrees), longitude (decimal degrees), altitude (decimal meters) and accuracy (decimal meters)
See https://getodk.github.io/xforms-spec/#data-types
You might also try selected-at(${GeoPointVariable}, 3), Index here starts from 0.
https://getodk.github.io/xforms-spec/#fn:selected-at
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