Data Format Description Language (DFDL) v1.0 Specification
OGF Proposed Recommendation GFD-P-R.174, January 31, 2011
A sequence having no children is syntactically legal in DFDL. In the data stream, such a sequence can have non-zero length LeftFraming and RightFraming regions, but the SequenceContent region in between must be empty. It is a processing error if the SequenceContent region of an empty sequence has non-zero length when parsing.
XML schema does not define an empty sequence that is the content of a complex type as effective content so any DFDL annotations on such a construct would be ignored. It is a schema definition error if the empty sequence is the content of a complex type.
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