DANSK DSF/ISO/IEC PRF 23415 PDF

The goals of version 1.0 are as follows: 1. Leverage XML technology and concepts 2. Support very efficient parsers/formatters 3. Avoid features that require unnecessary data copying 4. Support round-tripping, that is, read and write data in a described format from the same description 5. Keep simple cases simple 6. Simple descriptions should be "human readable" to the same degree that XSD is. The general features of version 1.0 are as follows: a) Text and binary data parsing and unparsing b) Validate the data when parsing and unparsing using XSD validation. c) Defaulted input and output for missing representations d) Reference – use of the value of a previously read element in subsequent expressions e) Choice – capability to select among format variations f) Hidden groups of elements – A description of an intermediate representation the corresponding Infoset items of which are not exposed in the final Infoset. g) Basic arithmetic in DFDL expressions. h) Out-of-type value handling (e.g., The string value 'NIL' to indicate nil for an integer) i) Speculative parsing to resolve uncertainty. j) Very general parsing capability: Lookahead/Push-back