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add reference to RFC 9535 #2

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add reference to RFC 9535 #2

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Update 4a-rules.md
dret Feb 1, 2025
de3b7df
explaining relationship to RFC 9535
dret Feb 4, 2025
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2 changes: 1 addition & 1 deletion docs/guides/4a-rules.md
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Expand Up @@ -36,7 +36,7 @@ Let's look at all the properties that can be used for a rule.

The `given` property is conceptually similar to a selector in CSS, in that it indicates the part of the document to apply rules to.

`given` has a specific syntax known as [JSONPath](https://goessner.net/articles/JsonPath/index.html), which is similar to XPath. JSONPath isn't yet a standard (it [should be](https://tools.ietf.org/html/draft-normington-jsonpath-00) someday), and has a few competing implementations. Spectral uses [nimma](https://www.npmjs.com/package/nimma) as its main implementation, and sometimes resorts to [jsonpath-plus](https://www.npmjs.com/package/jsonpath-plus) to ensure backwards-compatibility. Both support all the main JSONPath functionality and a bit more, but this syntax may differ slightly from other JSONPath implementations.
`given` has a specific syntax known as [JSONPath](https://goessner.net/articles/JsonPath/index.html), which is similar to XPath. JSONPath has a few competing implementations. Spectral uses [nimma](https://www.npmjs.com/package/nimma) as its main implementation, and sometimes resorts to [jsonpath-plus](https://www.npmjs.com/package/jsonpath-plus) to ensure backwards-compatibility. Both support all the main JSONPath functionality and a bit more, but this syntax may differ slightly from other JSONPath implementations. Currently the implementation that Spectral uses is not fully aligned with [IETF RFC 9535](https://datatracker.ietf.org/doc/rfc9535/) (published in February 2024) which also is titled "JSONPath".

Your `given` value can be a string containing any valid JSONPath expression, or an array of expressions to apply a rule to multiple parts of a document.
You can also consume your [aliases](4c-aliases.md) here if you have some defined.
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