Accept a list of references in the trigger column

[lognaturel]

The trigger column in XLSForm makes it possible to specify a reference to a field which, when changed by the user, triggers the run of the calculation defined in the row.

This corresponds to the XForms setvalue action with an xforms-value-change event trigger. XForms allows multiple setvalue actions to affect the same target node but that currently can't be expressed in an XLSForm.

Accepting a list of trigger references would expand flexibility without adding much complexity.

https://forum.getodk.org/t/different-behaviour-between-enketo-and-odk-collect-on-trigger-and-instance/50304/5

• decide on separator

[tiritea]

FWIW I have no preference on the delimiter

Minor point: is it possible today to write an explicit XPath for the trigger, eg /data/foo, or do they all need to be a ${foo} reference? (in case that has any implications on an appropriate delimiter...)