conformance.tex

   1 Normative text is text that describes elements of
   2 the design that are indispensable or contains the
   3 conformance language keywords: `shall', `should', or `may'.
   4 Informative text is text that is potentially helpful to the user,
   5 but not indispensable, and can be removed, changed, or added
   6 editorially without affecting interoperability. Informative
   7 text does not contain any conformance keywords.
   8
   9 All text in this document is, by default, normative,
  10 except: the Introduction, any section explicitly labelled as `Informative'
  11 or individual paragraphs that are also indicated in this way.
  12
  13 The keywords `shall' and `shall not' indicate requirements
  14 strictly to be followed in order to conform to the document
  15 and from which no deviation is permitted
  16
  17 The keywords, `should' and `should not' indicate that, among
  18 several possibilities, one is recommended as particularly suitable,
  19 without mentioning or excluding others; or that a certain course
  20 of action is preferred but not necessarily required; or that
  21 (in the negative form) a certain possibility or course of action i
  22 s deprecated but not prohibited.
  23
  24 The keywords `may' and `need not' indicate courses of action
  25 permissible within the limits of the document.
  26
  27 The keyword `reserved' indicates a provision that is not
  28 defined at this time, shall not be used, and may be defined
  29 in the future. The keyword `forbidden' indicates `reserved' and in
  30  addition indicates that the provision will never be defined in the future.
  31
  32 A conformant implementation according to this document is one that includes
  33 all mandatory provisions (`shall') and, if implemented, all recommended
  34 provisions (`should') as described. A conformant implementation need
  35 not implement optional provisions (`may') and need not implement them as described.
  36
  37 \section{Normative References}
  38 Normative references are external documents referenced in normative
  39 text that are indispensable to the user. Bibliographic references
  40 are references made in informative text or are those otherwise not
  41  indispensable to the user.
  42
  43 The following standards contain provisions which, through
  44  reference in this text, constitute provisions of this standard.
  45  At the time of publication, the editions indicated were valid.
  46  All standards are subject to revision, and parties to agreements
  47   based on this standard are encouraged to investigate the
  48   possibility of applying the most recent edition of the standards indicated below.
  49
  50 \begin{enumerate}
  51 \item ITU-R BT.601-6: Studio Encoding Parameters of Digital Television
  52 for standard 4:3 and Wide-screen 16:9 Aspect Ratios.
  53 \item ITU-R BT.709-5: Parameter values for the HDTV
  54 standards for production and international programme exchange, 2002.
  55 \item SMPTE 428.1: Digital Cinema Distribution Master (DCDM)
  56 Image Characteristics.
  57 \item ITU-T H.264 (03/2005): Advanced video coding for generic
  58 audiovisual services.
  59 (Note: ISO/IEC 14496-10:2005, Information Technology  — Coding of
  60 Audio-Visual Objects – Part 10, is a direct equivalent to ITU-T H.264.)
  61 \item ITU-BT.1361: Worldwide unified colorimetry and related
  62 characteristics of future television and imaging systems.
  63 \item SMPTE 2036-1: Ultra High Definition Television — Image
  64 Parameter Values For Program Production.
  65 \end{enumerate}