Erratum 2.100 clarified that such an element has variable length when 
unparsing. 
Sections 12.3.7 and dfdl:textPadKind have not been fully updated to make 
this clear.
Attached Word document has marked up changes to correct the above, plus 
some comments.
Regards
Steve Hanson
Architect, IBM Data Format Description Language (DFDL)
Co-Chair, OGF DFDL Working Group
IBM SWG, Hursley, UK
smh(a)uk.ibm.com
tel:+44-1962-815848
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