For discussion on DFDL WG call.

Please find proposal from IBM to clarify the allowable characters that be used in some of the DFDL properties that are defined as type 'DFDL String Literal'. It is proposed that the properties in question do not need the full power of DFDL String Literal.

escaping ( single character )
escapeCharacter
escapeEscapeCharacter
escapeBlockStart
escapeBlockEnd

Property value must resolve to a single character
DFDL character entities are allowed
The raw byte entity ( %#r ) is not allowed
DFDL Character classes ( NL, WSP, WSP+, WSP*, ES ) are not allowed

padding ( single character or byte )
textStringPadCharacter
textNumberPadCharacter
textBooleanPadCharacter
textCalendarPadCharacter

Property value must resolve to a single character or a single byte value
DFDL character entities are allowed
The raw byte entity ( %#r ) is allowed subject to the restrictions already documented for these properties
DFDL Character classes ( NL, WSP, WSP+, WSP*, ES ) are not allowed

Number separators ( single character )
textStandardDecimalSeparator
textStandardGroupingSeparator
textStandardExponentCharacter

Property value must resolve to a single character
DFDL character entities are allowed
The raw byte entity ( %#r ) is not allowed
DFDL Character classes ( NL, WSP, WSP+, WSP*, ES ) are not allowed

Number representations ( multiple characters )
textStandardInfinityRep
textStandardNanRep
textStandardZeroRep

DFDL character entities are allowed
The raw byte entity ( %#r ) is not allowed
DFDL Character classes ( NL, WSP, WSP+, WSP*, ES ) are not allowed

Boolean representations ( multiple characters )
textBooleanTrueRep
textBooleanFalseRep

DFDL character entities are allowed
The raw byte entity ( %#r ) is not allowed
DFDL Character classes ( NL, WSP, WSP+, WSP*, ES ) are not allowed

Nil representations ( multiple characters/bytes )
nilValue

DFDL character entities are allowed
The raw byte entity ( %#r ) is allowed
DFDL Character classes ( NL, WSP, WSP+, WSP*, ES ) are allowed

Regards

Steve Hanson
Architect, Data Format Description Language (DFDL)
Co-Chair, OGF DFDL Working Group
IBM SWG, Hursley, UK
smh@uk.ibm.com
tel:+44-1962-815848

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