[DFDL-WG] What is Rationale why Nillable complex type elements can only have '%ES; ' as their dfdl:nilValue property

[Mike Beckerle]

DFDL has this seemingly ad-hoc restriction.

Users naturally want to model a complex element where "-" (dash) means the
whole complex element is nilled, and if not "-" then we parse and produce a
complex element.

What is the rationale for this restriction?
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