@@ -337,11 +337,24 @@ identifiers](#w3cwd-fragid-best-practices-20121025), plain name fragment
337337identifiers in ` application/schema+json ` are reserved for referencing locally
338338named schemas.
339339
340- Plain name fragments MUST start with a letter ([ A-Za-z] ) or underscore ("\_ "),
341- followed by any number of letters, digits ([ 0-9] ), hyphens ("-"), underscores
342- ("\_ "), and periods ("."). This matches the US-ASCII part of XML's [ NCName
343- production] ( #xml-names ) , which allows for compatibility with the recommended
344- plain name [ syntax] ( #w3crec-xptr-framework-20030325 ) for XML-based media types.
340+ Plain name fragments MUST follow XML's [ ` NCName ` production] ( #xml-names ) , which
341+ allows for compatibility with the recommended plain name
342+ [ syntax] ( #w3crec-xptr-framework-20030325 ) for XML-based media types. For
343+ convenience, the ` NCName ` syntax is reproduced here in ABNF form, using
344+ a minimal set of rules:
345+ 346+ ``` abnf
347+ NCName = NCNameStartChar *NCNameChar
348+ NCNameStartChar = "_" / ALPHA
349+ / %xC0-D6 / %xD8-F6 / %xF8-2FF
350+ / %x370-37D / %x37F-1FFF
351+ / %x200C-200D / %x2070-218F
352+ / %x2C00-2FEF / %x3001-D7FF
353+ / %xF900-FDCF / %xFDF0-FFFD
354+ / %x10000-EFFFF
355+ NCNameChar = NCNameStartChar / "-" / "." / DIGIT
356+ / %xB7 / %x0300-036F / %x203F-2040
357+ ```
345358
346359All fragment identifiers that do not match the JSON Pointer syntax MUST be
347360interpreted as plain name fragment identifiers.
@@ -3286,7 +3299,7 @@ to the document.
32863299
32873300### draft-bhutton-json-schema-next
32883301- ` contains ` now applies to objects as well as arrays
3289- - Use IRIs instead of URIs
3302+ - Use IRIs instead of URIs, including allowing unicode in plain-name fragments
32903303- Clarify that detecting duplicate IRIs for different schemas SHOULD raise an error
32913304- Consolidate and clarify the syntax and rationale for plain-name fragments
32923305- "$id" MUST be an absolute-IRI, without any fragment, even an empty one
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