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webp-container-spec.txt: update 'key words' text

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RFC 2119 was updated by RFC 8174; use the text from there

+ change INFORMATIVE to informative to avoid confusion with the key
  words in the RFCs

Change-Id: I0a3fe9dc48d284e7ac95633896ffb855ecd1a229
This commit is contained in:
James Zern 2022-08-01 18:37:19 -07:00
parent 3fe15b6773
commit ddbf3f3f2a
1 changed files with 6 additions and 4 deletions
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10
doc/webp-container-spec.txt
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@ -46,9 +46,10 @@ for:
* **Animation.** An image may have multiple frames with pauses between them, * **Animation.** An image may have multiple frames with pauses between them,
making it an animation. making it an animation.
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC 2119][]. document are to be interpreted as described in BCP 14 [RFC 2119][] [RFC 8174][]
when, and only when, they appear in all capitals, as shown here.
Bit numbering in chunk diagrams starts at `0` for the most significant bit Bit numbering in chunk diagrams starts at `0` for the most significant bit
('MSB 0') as described in [RFC 1166][]. ('MSB 0') as described in [RFC 1166][].
@ -531,7 +532,7 @@ Reserved (Rsv): 2 bits
Pre-processing (P): 2 bits Pre-processing (P): 2 bits
: These INFORMATIVE bits are used to signal the pre-processing that has : These _informative_ bits are used to signal the pre-processing that has
been performed during compression. The decoder can use this information to been performed during compression. The decoder can use this information to
e.g. dither the values or smooth the gradients prior to display. e.g. dither the values or smooth the gradients prior to display.
@ -817,3 +818,4 @@ RIFF/WEBP
[metadata]: https://web.archive.org/web/20180919181934/http://www.metadataworkinggroup.org/pdf/mwg_guidance.pdf [metadata]: https://web.archive.org/web/20180919181934/http://www.metadataworkinggroup.org/pdf/mwg_guidance.pdf
[rfc 1166]: https://datatracker.ietf.org/doc/html/rfc1166 [rfc 1166]: https://datatracker.ietf.org/doc/html/rfc1166
[rfc 2119]: https://datatracker.ietf.org/doc/html/rfc2119 [rfc 2119]: https://datatracker.ietf.org/doc/html/rfc2119
[rfc 8174]: https://datatracker.ietf.org/doc/html/rfc8174