@@ -330,14 +330,14 @@ an annotation.
330330
331331Implementations:
332332
333- - SHOULD provide validation for each format attribute defined in this document
334- and listed in the {{format-registry}};
333+ - SHOULD provide validation for each format attribute defined in this document;
334+ - are encouraged to provide validation for format attributes listed in the
335+ {{format-registry}};
335336- MAY support format values not defined in this document or listed in the
336337 registry, but such support MUST be configurable and disabled by default;
337338- SHOULD use a common parsing library or a well-known regular expression for
338339 each format;
339- - SHOULD clearly document how and to what degree each format attribute is
340- validated.
340+ - SHOULD clearly document any limitations regarding format validation.
341341
342342The requirement for validation of format values in general is limited to
343343syntactic checking; implementations SHOULD NOT attempt to send an email, connect
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