15 Syntax (構文)

15 Syntax (構文)

RTSP の構文は RFC 2068 [2] で用いられる拡張バッカス・ナウア形式 (augmented Backus-Naur form, BNF) で記述される。

15.1 Base Syntax (基本構文)

OCTET              =      <any 8-bit sequence of data>
CHAR               =      <any US-ASCII character (octets 0 - 127)>
UPALPHA            =      <any US-ASCII uppercase letter "A".."Z">
LOALPHA            =      <any US-ASCII lowercase letter "a".."z">
ALPHA              =      UPALPHA | LOALPHA

DIGIT              =      <any US-ASCII digit "0".."9">
CTL                =      <any US-ASCII control character (octets 0 - 31) and DEL (127)>
CR                 =      <US-ASCII CR, carriage return (13)>
LF                 =      <US-ASCII LF, linefeed (10)>

SP                 =      <US-ASCII SP, space (32)>
HT                 =      <US-ASCII HT, horizontal-tab (9)>
DQUOTE             =      <US-ASCII double-quote mark (34)>
CRLF               =      CR LF

LWS                =      [CRLF] 1*( SP | HT )
TEXT               =      <any OCTET except CTLs>
tspecials          =      "(" | ")" | "<" | ">" | "@" |
                          "," | ";" | ":" | "\" | DQUOTE |
                          "/" | "[" | "]" | "?" | "=" |
                          "{" | "}" | SP | HT

token              =      1*<any CHAR except CTLs or tspecials>
quoted-string      =      ( DQUOTE *(qdtext) DQUOTE )
qdtext             =      <any TEXT except DQUOTE>
quoted-pair        =      "\" CHAR

message-header     =      field-name ":" [ field-value ] CRLF
field-name         =      token
field-value        =      *( field-content | LWS )
field-content      =      <the OCTETs making up the field-value and consisting of either *TEXT or combinations of token, tspecials, and quoted-string>

safe               =  "\$" | "-" | "_" | "." | "+"
extra              =  "!" | "*" | "'" | "(" | ")" | ","

hex                =  DIGIT | "A" | "B" | "C" | "D" | "E" | "F" | "a" | "b" | "c" | "d" | "e" | "f"
escape             =  "\%" hex hex
reserved           =  ";" | "/" | "?" | ":" | "@" | "&" | "="

unreserved         =  alpha | digit | safe | extra
xchar              =  unreserved | reserved | escape