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ABNF for RTSP 2.0 – Real Time Streaming Protocol – RFC 7826

 

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RTSP/2.0 — IRIs

Section 20.2.1

RTSP-IRI   =
schemes    ":"    IRI‑rest
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IRI-rest   =
ihier-part    [ "?"    iquery ]
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ihier-part   =
"//"    iauthority    ipath‑abempty
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RTSP-IRI-ref   =
RTSP‑IRI  /  irelative‑ref
irelative-ref   =
irelative-part    [ "?"    iquery ]
irelative-part   =
"//"    iauthority    ipath‑abempty  /  ipath‑absolute  /  ipath‑noscheme  /  ipath‑empty
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ipath   =
ipath‑abempty  /    ; begins with "/" or is empty
ipath‑absolute  /    ; begins with "/" but not "//"
ipath‑noscheme  /    ; begins with a non-colon segment
ipath‑rootless  /    ; begins with a segment
ipath‑empty   ; zero characters
ipath-abempty   =
*( "/"    isegment )
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ipath-absolute   =
"/"    [ isegment‑nz    *( "/"    isegment ) ]
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ipath-noscheme   =
isegment‑nz‑nc    *( "/"    isegment )
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ipath-rootless   =
isegment‑nz    *( "/"    isegment )
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ipath-empty   =
0<ipchar>
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isegment   =
*ipchar    [ ";"    *ipchar ]
isegment-nz   =
1*ipchar    [ ";"    *ipchar ]   /   ";"    *ipchar
isegment-nz-nc   =
( 1*ipchar‑nc    [ ";"    *ipchar‑nc ] )   /   ";"    *ipchar‑nc

; non-zero-length segment without any colon ":"
; no parameter (";" delimited) inside path

ipchar   =
iunreserved   /   pct‑encoded   /   sub‑delims   /   ":"   /   "@"
ipchar-nc   =
iunreserved   /   pct‑encoded   /   sub‑delims   /   "@"

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