XForms: binding to an optional element
I asked this on the XSLTForms list, but it’s worth casting a wider net.
Say I have an XML instance like this:
Possible values for the format element are “xml”, “text”, “binary”, or a default setting, indicated by a complete absence of the <format> element. I’d like this to attach to a select1 with four choices:
Where the first three set the value of the <format> element, and the fourth omits the element altogether. In XForms 1.0, the difficulty comes from binding to a nonexistent element, which causes it to become non-relevant. Are there features from 1.1, 1.2, or extensions that make this case easier? Anyone have an example?