Controls whether a xmlns="http://example.com" default namespace prefix definition will be provided for the embedded schema. This matters when the defined schema is used to validate the infoset xml before unparsing, or after parsing, as it affects the interpretation of path expressions in the DFDL schema based on the unqualifiedPathStepPolicy tunable. False is recommended since default namespaces can be confusing. Not to be confused with dfdl:byteOrder, this attribute describes the order of bits or bytes in the TDML document part, that is, whether they should be given their positions starting from the beginning (LTR) or the end (RTL). LTR is the normal default where data location number increase from left to right. RTL is used for bit-order LSBFirst, and the bytes are ordered starting on the right increasing to the left.