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adds server url template abnf #4264

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adds server url template abnf #4264

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ee4b871
docs: adds server url template anbf
baywet Dec 18, 2024
a89f36d
fix: expands the allowed set for server templates literal
baywet Dec 19, 2024
72eec29
fix: adds literals to the list of imported definitions
baywet Dec 19, 2024
cf00256
nit: groups literals with the imported definitions
baywet Dec 19, 2024
069f2be
nit: aligns literal definition
baywet Dec 19, 2024
e3f9dca
fix: updates literals with content from errata
baywet Dec 20, 2024
d1ce259
nit: changes the server variable name to avoid confusion and allow fo…
baywet Dec 20, 2024
45f197a
fix: adds mention that errata has been applied
baywet Dec 23, 2024
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26 changes: 26 additions & 0 deletions src/oas.md
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Expand Up @@ -557,6 +557,32 @@ servers:

An object representing a Server Variable for server URL template substitution.

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The server URL templating is defined by the following [ABNF](https://tools.ietf.org/html/rfc5234) syntax.

```abnf
server-url-template = 1*( literals / template-expression )
template-expression = "{" template-expression-param-name "}"
template-expression-param-name = 1*( %x00-79 / %x7C / %x7E-10FFFF ) ; every UTF8 character except { and }
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literals = 1*( %x21 / %x23-24 / %x26 / %x28-3B / %x3D / %x3F-5B
/ %x5D / %x5F / %x61-7A / %x7E / ucschar / iprivate
/ pct-encoded)
; any Unicode character except: CTL, SP,
; DQUOTE, "'", "%" (aside from pct-encoded),
; "<", ">", "\", "^", "`", "{", "|", "}"


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pct-encoded = "%" HEXDIG HEXDIG
ucschar = %xA0-D7FF / %xF900-FDCF / %xFDF0-FFEF
/ %x10000-1FFFD / %x20000-2FFFD / %x30000-3FFFD
/ %x40000-4FFFD / %x50000-5FFFD / %x60000-6FFFD
/ %x70000-7FFFD / %x80000-8FFFD / %x90000-9FFFD
/ %xA0000-AFFFD / %xB0000-BFFFD / %xC0000-CFFFD
/ %xD0000-DFFFD / %xE1000-EFFFD
iprivate = %xE000-F8FF / %xF0000-FFFFD / %x100000-10FFFD
```

Here, `literals`, `pct-encoded`, `uschar` and `iprivate` definitions are taken from [RFC 6570](https://www.rfc-editor.org/rfc/rfc6570).
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##### Fixed Fields

| Field Name | Type | Description |
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