Spec proposal: end-geopoint to automatically capture location upon form completion

[Xiphware]

@LN

Did you also consider exploring how we could surface setgeopoint triggered by a value change event in XLSForm?

I've posted a proposed XLSForm spec change for this here: Spec proposal: expose xforms-value-changed event with odk:setgeopoint action in XLSForm

Feedback welcome.