Dynamic itemset labels (aka XPath in itemset labels)

[avernet]

E.g. the user is asked to enter the name of her parents, and later is asked to make a choice between the two parents.

+1 from community

[ebruchez]

And so the idea would be to modify the itemset editor to support not only a static label, but a formula.

We could also decide not to support arbitrary formulas at first, but just have two options:

• static label (supporting i18n)
• value of an existing control

[ebruchez]

Would be a natural follow-up to #1342. Changes would be in the Edit Choices dialog.

Each item label can have its own distinct template. For example:

• "Father ({$father})"
• "Mother ({$mother})"

It's probably reasonable to have a single set of template parameters for the whole set of items. This would go below the list of items.

At runtime, the <xf:label ref="label"/> must be updated in view.xsl to use xxf:r(), probably, and pick the right template with indexes, which implies #1328.