A Media Resource Control Protocol (MRCP) Developed by Cisco, Nuance, and Speechworks
draft-shanmugham-mrcp-07

[Ballot comment]
References should be split normative/informative.

Previous discuss text:

Missing security considerations and IANA considerations sections.

I don't quite understand if the application/mrcp content, which looks like XML to me, is a normative part of this specification.  If it is, a normative reference to the appropriate W3C XML specifications needs to be added.

Where is the application/mrcp MIME type registered?  It's not in the IANA registry now, and I don't see a template in the document.

I do believe a security considerations section should be added before
publication.  However under RFC 3932, that does not seem to be
sufficient to justify a dnp note, only a comment to the rfc-editor.

[Ballot comment]
Instead of net 10 addresses they should use the addresses as per RFC3330
for the examples

Instead of their current fqdns, they should use xxx.example.com

[Ballot comment]
Reviewed by Spencer Dawkins, Gen-ART

His review:

Using the criteria for Individual RFC-Editor Submissions:

Reviews should focus on these questions: "Does this document
represent an end run around the IETF's working groups
or its procedures? Does this document present an incompatible
change to IETF technologies as if it were compatible?"

This document is ready for publication as an Informational RFC.

I would have more comments if it was an IETF document.

[Ballot discuss]
ABNF errors in the collected ABNF:
168:0: Rule Content-Type previously referred to as content-type
- This is relatively harmless, but it's nice to keep the capitalization
consistent.

351:0: Rule speech-length-value was already defined on line 281
353:0: Rule text-speech-length was already defined on line 284
356:0: Rule numeric-speech-length was already defined on line 286
361:0: Rule numeric-speech-unit was already defined on line 289

- This group of 4 rules appears twice in the collected ABNF.

379:0: Rule completion-cause was already defined on line 302
400:0: Rule fetch-timeout was already defined on line 338

- These two individual rules each appears twice in the collected ABNF.


ABNF errors in the individual rules in the document:
6:50: '/' is the alternation character in ABNF
- This is triggered by the definition of "start-line", but there are quite a few others.

38:0: Rule message-header was already defined on line 8
- message-header is defined in section 5 as "1*(generic-header | resource-header)" but then in section 5.4 as "field-name ":" [ field-value ]".

40:56: unterminated prose-val
- This is the definition of field-content.  Technically, RFC2234 does not permit multi-line prose-vals.

62:23: Illegal character '#' - skipping to end of line
- The definition of content-encoding uses RFC822 ABNF syntax

67:44: Illegal character '#' - skipping to end of line
- The definition of cache-control uses RFC822 ABNF syntax

159:0: Rule speech-length-value was already defined on line 109
161:0: Rule text-speech-length was already defined on line 111
163:0: Rule numeric-speech-length was already defined on line 113
167:0: Rule numeric-speech-unit was already defined on line 115
- This is the redefintion of these rules in both Jump-Target and Speak Length.  It might be better to define them once and cross-reference.

216:0: Rule completion-cause was already defined on line 126
- completion-cause is defined in both 7.4.4 and 8.4.8.

-- I didn't go into the specifics of the further duplicate definitions.
226:0: Rule vendor-specific was already defined on line 135
230:0: Rule vendor-specific-av-pair was already defined on line 138
239:0: Rule fetch-timeout was already defined on line 149
240:0: Rule failed-uri was already defined on line 151
241:0: Rule failed-uri-cause was already defined on line 152
245:0: Rule speech-language was already defined on line 143

Many of the rules do not match the examples, at least partly because the rules do not permit linear whitespace as the examples contain.  You probably want to use constructs such as HCOLON and SWS as the SIP spec (RFC 3261) does.  Oddly, some of the rules do explicitly have *WSP and others don't.

There are a significant number of differences between the ABNF in the document and the collected ABNF.  Here is the list that was easy to get.  There may be others, or some of these differences may be due to some of the above parse errors resulting in trouble getting to the canonical format.

--- mrcp-canon  Wed Sep 15 21:17:05 2004
+++ mrcp-collected-canon        Wed Sep 15 21:16:51 2004
@@ -1,111 +1,142 @@
; ALPHA UNDEFINED
; CHAR UNDEFINED
; CRLF UNDEFINED
-; DEFINE-GRAMMAR UNDEFINED
; DIGIT UNDEFINED
-; GET-PARAMS UNDEFINED
-; GET-RESULT UNDEFINED
-; LWS UNDEFINED
-; RECOGNITION-COMPLETE UNDEFINED
-; RECOGNITION-START-TIMERS UNDEFINED
-; RECOGNIZE UNDEFINED
-; SET-PARAMS UNDEFINED
+; DQUOTE UNDEFINED
+; HEXDIG UNDEFINED
+; OCTET UNDEFINED
; SP UNDEFINED
-; START-OF-SPEECH UNDEFINED
-; STOP UNDEFINED
-; TEXT UNDEFINED
-; Url UNDEFINED
-; absoluteURI UNDEFINED
-; and UNDEFINED
-; cache-control UNDEFINED
-; cache-directive defined but not used
-; combinations UNDEFINED
-; confidence-threshold UNDEFINED
-; consisting UNDEFINED
-; content-encoding UNDEFINED
+; WSP UNDEFINED
; content-id UNDEFINED
-; content-length UNDEFINED
-; content-type UNDEFINED
-; either UNDEFINED
-; field-name defined but not used
-; field-value defined but not used
; generic-message defined but not used
-; message-body UNDEFINED
-; of UNDEFINED
-; or UNDEFINED
-; prosody-param-name UNDEFINED
-; prosody-param-value UNDEFINED
-; relativeURI UNDEFINED
-; speech-complete-timeout UNDEFINED
-; speech-incomplete-timeout UNDEFINED
-; status-code UNDEFINED
-; token UNDEFINED
-; uri UNDEFINED
-; vendor-av-pair-name UNDEFINED
-; vendor-av-pair-value UNDEFINED
-; voice-param-name UNDEFINED
-; voice-param-value UNDEFINED
+Content-Type = "Content-Type:" media-type
+IPv4address = 1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT
+IPv6address = hexpart [ ":" IPv4address ]
+IPv6reference = "[" IPv6address "]"
+LWS = [ *WSP CRLF ] 1*WSP
+SWS = [ LWS ]
+UTF8-CONT = %x80-BF
+UTF8-NONASCII = ( %xC0-DF UTF8-CONT ) / ( %xE0-EF 2UTF8-CONT ) / ( %xF0-F7 3UTF8-CONT ) / ( %xF8-FB 4UTF8-CONT ) / ( %xFC-FD 5UTF8-CONT )
+abs-path = "/" path-segments
+absoluteURI = scheme ":" ( hier-part / opaque-part )
active-request-id-list = "Active-Request-Id-List:" request-id *( "," request-id ) CRLF
+alphanum = ALPHA / DIGIT
+attribute = token
audio-fetch-hint = "Audio-Fetch-Hint:" 1*ALPHA CRLF
+authority = srvr / reg-name
boolean-value = "true" / "false"
+cache-control = "Cache-Control:" *WSP cache-directive *( *WSP "," *WSP cache-directive *WSP ) CRLF
cache-directive = ( "max-age=" delta-seconds ) / ( "max-stale=" delta-seconds ) / ( "min-fresh=" delta-seconds )
completion-cause = "Completion-Cause:" 1*DIGIT SP 1*ALPHA CRLF
+confidence-threshold = "Confidence-Threshold:" 1*DIGIT CRLF
content-base = "Content-Base:" absoluteURI CRLF
+content-coding = token
+content-encoding = "Content-Encoding:" *WSP content-coding *( *WSP "," *WSP content-coding *WSP ) CRLF
+content-length = "Content-Length:" 1*DIGIT CRLF
content-location = "Content-Location:" ( absoluteURI / relativeURI ) CRLF
delta-seconds = 1*DIGIT
+domainlabel = alphanum / ( alphanum *( alphanum / "-" ) alphanum )
dtmf-interdigit-timeout = "DTMF-Interdigit-Timeout:" 1*DIGIT CRLF
dtmf-term-char = "DTMF-Term-Char:" CHAR CRLF
dtmf-term-timeout = "DTMF-Term-Timeout:" 1*DIGIT CRLF
+escaped = "%" HEXDIG HEXDIG
event-line = event-name SP request-id SP request-state SP mrcp-version CRLF
event-name = synthesizer-event / recognizer-event
-failed-uri = "Failed-URI:" Url CRLF
+failed-uri = "Failed-URI:" absoluteURI CRLF
failed-uri-cause = "Failed-URI-Cause:" 1*ALPHA CRLF
fetch-hint = "Fetch-Hint:" 1*ALPHA CRLF
fetch-timeout = "Fetch-Timeout:" 1*DIGIT CRLF
-field-content =  and consisting of either *TEXT or combinations of token
-field-name = token
-field-value = *( field-content / LWS )
-generic-header = active-request-id-list / proxy-sync-id / content-id / content-type / content-length / content-base / content-location / content-encoding / cache-control / logging-tag
+generic-header = active-request-id-list / proxy-sync-id / content-id / Content-Type / content-length / content-base / content-location / content-encoding / cache-control / logging-tag
generic-message = start-line message-header CRLF [ message-body ]

+hex4 = 1*4HEXDIG
+hexpart = hexseq / ( hexseq "::" [ hexseq ] ) / ( "::" [ hexseq ] )
+hexseq = hex4 *( ":" hex4 )
+hier-part = ( net-path / abs-path ) [ "?" query ]
+host = hostname / IPv4address / IPv6reference
+hostname = *( domainlabel "." ) toplabel [ "." ]
+hostport = host [ ":" port ]
jump-target = "Jump-Size:" speech-length-value CRLF
kill-on-barge-in = "Kill-On-Barge-In:" boolean-value CRLF
logging-tag = "Logging-Tag:" 1*ALPHA CRLF
+mark = "-" / "_" / "." / "!" / "~" / "*" / "'" / "(" / ")"
+media-type = type "/" subtype *( ";" parameter )
+message-body = *OCTET
message-header = 1*( generic-header / resource-header )
method-name = synthesizer-method / recognizer-method
mrcp-version = "MRCP/" 1*DIGIT "." 1*DIGIT
n-best-list-length = "N-Best-List-Length:" 1*DIGIT CRLF
+net-path = "//" authority [ abs-path ]
new-audio-channel = "New-Audio-Channel:" boolean-value CRLF
no-input-timeout = "No-Input-Timeout:" 1*DIGIT CRLF
numeric-speech-length = ( "+" / "-" ) 1*DIGIT SP numeric-speech-unit
numeric-speech-unit = "Second" / "Word" / "Sentence" / "Paragraph"
+opaque-part = uric-no-slash *uric
+param = *pchar
+parameter = attribute "=" value
+password = *( unreserved / escaped / "&" / "=" / "+" / "$" / "," )
+path-segments = segment *( "/" segment )
+pchar = unreserved / escaped / ":" / "@" / "&" / "=" / "+" / "$" / ","
+port = 1*DIGIT
+prosody-param-name = 1*ALPHA
+prosody-param-value = 1*alphanum
prosody-parameter = "Prosody-" prosody-param-name ":" prosody-param-value CRLF
proxy-sync-id = "Proxy-Sync-Id:" 1*ALPHA CRLF
+qdtext = LWS / "!" / %x23-5B / %x5D-7E / UTF8-NONASCII
+query = *uric
+quoted-pair = "" ( %x00-09 / %x0B-0C / %x0E-7F )
+quoted-string = SWS DQUOTE *( qdtext / quoted-pair ) DQUOTE
recognition-timeout = "Recognition-Timeout:" 1*DIGIT CRLF
recognizer-context-block = "Recognizer-Context-Block:" 1*ALPHA CRLF
-recognizer-event = START-OF-SPEECH / RECOGNITION-COMPLETE
+recognizer-event = "START-OF-SPEECH" / "RECOGNITION-COMPLETE"
recognizer-header = confidence-threshold / sensitivity-level / speed-vs-accuracy / n-best-list-length / no-input-timeout / recognition-timeout / waveform-url / completion-cause / recognizer-context-block / recognizer-start-timers / vendor-specific / speech-complete-timeout / speech-incomplete-timeout / dtmf-interdigit-timeout / dtmf-term-timeout / dtmf-term-char / fetch-timeout / failed-uri / failed-uri-cause / save-waveform / new-audio-channel / speech-language
-recognizer-method = SET-PARAMS / GET-PARAMS / DEFINE-GRAMMAR / RECOGNIZE / GET-RESULT / RECOGNITION-START-TIMERS / STOP
+recognizer-method = "SET-PARAMS" / "GET-PARAMS" / "DEFINE-GRAMMAR" / "RECOGNIZE" / "GET-RESULT" / "RECOGNITION-START-TIMERS" / "STOP"
recognizer-start-timers = "Recognizer-Start-Timers:" boolean-value CRLF
+reg-name = 1*( unreserved / escaped / "$" / "," / ";" / ":" / "@" / "&" / "=" / "+" )
+rel-path = rel-segment [ abs-path ]
+rel-segment = 1*( unreserved / escaped / ";" / "@" / "&" / "=" / "+" / "$" / "," )
+relativeURI = ( net-path / abs-path / rel-path ) [ "?" query ]
request-id = 1*DIGIT
request-line = method-name SP request-id SP mrcp-version CRLF
request-state = "COMPLETE" / "IN-PROGRESS" / "PENDING"
+reserved = ";" / "/" / "?" / ":" / "@" / "&" / "=" / "+" / "$" / ","
resource-header = recognizer-header / synthesizer-header
-response-line = mrcp-version SP request-id SP status-code SP request-state CRLF
save-waveform = "Save-Waveform:" boolean-value CRLF
+scheme = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )
+segment = *pchar *( ";" param )
sensitivity-level = "Sensitivity-Level:" 1*DIGIT CRLF
speak-length = "Speak-Length:" speech-length-value CRLF
speak-restart = "Speak-Restart:" boolean-value CRLF
-speaker-profile = "Speaker-Profile:" uri CRLF
+speaker-profile = "Speaker-Profile:" absoluteURI CRLF
+speech-complete-timeout = "Speech-Complete-Timeout:" 1*DIGIT CRLF
+speech-incomplete-timeout = "Speech-Incomplete-Timeout:" 1*DIGIT CRLF
speech-language = "Speech-Language:" 1*ALPHA CRLF
speech-length-value = numeric-speech-length / text-speech-length
speech-marker = "Speech-Marker:" 1*ALPHA CRLF
speed-vs-accuracy = "Speed-Vs-Accuracy:" 1*DIGIT CRLF
-start-line = request-line / response-line / event-line
+srvr = [ [ userinfo "@" ] hostport ]
+start-line = request-line / status-line / event-line
+status-code = 1*DIGIT
+status-line = mrcp-version SP request-id SP status-code SP request-state CRLF
+subtype = token
synthesizer-event = "SPEECH-MARKER" / "SPEAK-COMPLETE"
synthesizer-header = jump-target / kill-on-barge-in / speaker-profile / completion-cause / voice-parameter / prosody-parameter / vendor-specific / speech-marker / speech-language / fetch-hint / audio-fetch-hint / fetch-timeout / failed-uri / failed-uri-cause / speak-restart / speak-length
synthesizer-method = "SET-PARAMS" / "GET-PARAMS" / "SPEAK" / "STOP" / "PAUSE" / "RESUME" / "BARGE-IN-OCCURRED" / "CONTROL"
text-speech-length = 1*ALPHA SP "Tag"
+token = 1*( alphanum / "-" / "." / "!" / "%" / "*" / "_" / "+" / "`" / "'" / "~" )
+toplabel = ALPHA / ( ALPHA *( alphanum / "-" ) alphanum )
+type = token
+unreserved = alphanum / mark
+uric = reserved / unreserved / escaped
+uric-no-slash = unreserved / escaped / ";" / "?" / ":" / "@" / "&" / "=" / "+" / "$" / ","
+user = 1*( unreserved / escaped / user-unreserved )
+user-unreserved = "&" / "=" / "+" / "$" / "," / ";" / "?" / "/"
+userinfo = user [ ":" password ] "@"
+value = token / quoted-string
+vendor-av-pair-name = 1*ALPHA
+vendor-av-pair-value = 1*alphanum
vendor-specific = "Vendor-Specific-Parameters:" vendor-specific-av-pair *( ";" vendor-specific-av-pair ) CRLF
vendor-specific-av-pair = vendor-av-pair-name "=" vendor-av-pair-value
+voice-param-name = 1*ALPHA
+voice-param-value = 1*alphanum
voice-parameter = "Voice-" voice-param-name ":" voice-param-value CRLF
-waveform-url = "Waveform-URL:" Url CRLF
+waveform-url = "Waveform-URL:" absoluteURI CRLF

[Ballot discuss]
ABNF errors in the collected ABNF:
168:0: Rule Content-Type previously referred to as content-type
- This is relatively harmless, but it's nice to keep the capitalization
consistent.

351:0: Rule speech-length-value was already defined on line 281
353:0: Rule text-speech-length was already defined on line 284
356:0: Rule numeric-speech-length was already defined on line 286
361:0: Rule numeric-speech-unit was already defined on line 289

- This group of 4 rules appears twice in the collected ABNF.

379:0: Rule completion-cause was already defined on line 302
400:0: Rule fetch-timeout was already defined on line 338

- These two individual rules each appears twice in the collected ABNF.


ABNF errors in the individual rules in the document:
6:50: '/' is the alternation character in ABNF
- This is triggered by the definition of "start-line", but there are quite a few others.

38:0: Rule message-header was already defined on line 8
- message-header is defined in section 5 as "1*(generic-header | resource-header)" but then in section 5.4 as "field-name ":" [ field-value ]".

40:56: unterminated prose-val
- This is the definition of field-content.  Technically, RFC2234 does not permit multi-line prose-vals.

62:23: Illegal character '#' - skipping to end of line
- The definition of content-encoding uses RFC822 ABNF syntax

67:44: Illegal character '#' - skipping to end of line
- The definition of cache-control uses RFC822 ABNF syntax

159:0: Rule speech-length-value was already defined on line 109
161:0: Rule text-speech-length was already defined on line 111
163:0: Rule numeric-speech-length was already defined on line 113
167:0: Rule numeric-speech-unit was already defined on line 115
- This is the redefintion of these rules in both Jump-Target and Speak Length.  It might be better to define them once and cross-reference.

216:0: Rule completion-cause was already defined on line 126
- completion-cause is defined in both 7.4.4 and 8.4.8.

-- I didn't go into the specifics of the further duplicate definitions.
226:0: Rule vendor-specific was already defined on line 135
230:0: Rule vendor-specific-av-pair was already defined on line 138
239:0: Rule fetch-timeout was already defined on line 149
240:0: Rule failed-uri was already defined on line 151
241:0: Rule failed-uri-cause was already defined on line 152
245:0: Rule speech-language was already defined on line 143

There are a significant number of differences between the ABNF in the document and the collected ABNF.  Here is the list that was easy to get.  There may be others, or some of these differences may be due to some of the above parse errors resulting in trouble getting to the canonical format.

--- mrcp-canon  Wed Sep 15 21:17:05 2004
+++ mrcp-collected-canon        Wed Sep 15 21:16:51 2004
@@ -1,111 +1,142 @@
; ALPHA UNDEFINED
; CHAR UNDEFINED
; CRLF UNDEFINED
-; DEFINE-GRAMMAR UNDEFINED
; DIGIT UNDEFINED
-; GET-PARAMS UNDEFINED
-; GET-RESULT UNDEFINED
-; LWS UNDEFINED
-; RECOGNITION-COMPLETE UNDEFINED
-; RECOGNITION-START-TIMERS UNDEFINED
-; RECOGNIZE UNDEFINED
-; SET-PARAMS UNDEFINED
+; DQUOTE UNDEFINED
+; HEXDIG UNDEFINED
+; OCTET UNDEFINED
; SP UNDEFINED
-; START-OF-SPEECH UNDEFINED
-; STOP UNDEFINED
-; TEXT UNDEFINED
-; Url UNDEFINED
-; absoluteURI UNDEFINED
-; and UNDEFINED
-; cache-control UNDEFINED
-; cache-directive defined but not used
-; combinations UNDEFINED
-; confidence-threshold UNDEFINED
-; consisting UNDEFINED
-; content-encoding UNDEFINED
+; WSP UNDEFINED
; content-id UNDEFINED
-; content-length UNDEFINED
-; content-type UNDEFINED
-; either UNDEFINED
-; field-name defined but not used
-; field-value defined but not used
; generic-message defined but not used
-; message-body UNDEFINED
-; of UNDEFINED
-; or UNDEFINED
-; prosody-param-name UNDEFINED
-; prosody-param-value UNDEFINED
-; relativeURI UNDEFINED
-; speech-complete-timeout UNDEFINED
-; speech-incomplete-timeout UNDEFINED
-; status-code UNDEFINED
-; token UNDEFINED
-; uri UNDEFINED
-; vendor-av-pair-name UNDEFINED
-; vendor-av-pair-value UNDEFINED
-; voice-param-name UNDEFINED
-; voice-param-value UNDEFINED
+Content-Type = "Content-Type:" media-type
+IPv4address = 1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT
+IPv6address = hexpart [ ":" IPv4address ]
+IPv6reference = "[" IPv6address "]"
+LWS = [ *WSP CRLF ] 1*WSP
+SWS = [ LWS ]
+UTF8-CONT = %x80-BF
+UTF8-NONASCII = ( %xC0-DF UTF8-CONT ) / ( %xE0-EF 2UTF8-CONT ) / ( %xF0-F7 3UTF8-CONT ) / ( %xF8-FB 4UTF8-CONT ) / ( %xFC-FD 5UTF8-CONT )
+abs-path = "/" path-segments
+absoluteURI = scheme ":" ( hier-part / opaque-part )
active-request-id-list = "Active-Request-Id-List:" request-id *( "," request-id ) CRLF
+alphanum = ALPHA / DIGIT
+attribute = token
audio-fetch-hint = "Audio-Fetch-Hint:" 1*ALPHA CRLF
+authority = srvr / reg-name
boolean-value = "true" / "false"
+cache-control = "Cache-Control:" *WSP cache-directive *( *WSP "," *WSP cache-directive *WSP ) CRLF
cache-directive = ( "max-age=" delta-seconds ) / ( "max-stale=" delta-seconds ) / ( "min-fresh=" delta-seconds )
completion-cause = "Completion-Cause:" 1*DIGIT SP 1*ALPHA CRLF
+confidence-threshold = "Confidence-Threshold:" 1*DIGIT CRLF
content-base = "Content-Base:" absoluteURI CRLF
+content-coding = token
+content-encoding = "Content-Encoding:" *WSP content-coding *( *WSP "," *WSP content-coding *WSP ) CRLF
+content-length = "Content-Length:" 1*DIGIT CRLF
content-location = "Content-Location:" ( absoluteURI / relativeURI ) CRLF
delta-seconds = 1*DIGIT
+domainlabel = alphanum / ( alphanum *( alphanum / "-" ) alphanum )
dtmf-interdigit-timeout = "DTMF-Interdigit-Timeout:" 1*DIGIT CRLF
dtmf-term-char = "DTMF-Term-Char:" CHAR CRLF
dtmf-term-timeout = "DTMF-Term-Timeout:" 1*DIGIT CRLF
+escaped = "%" HEXDIG HEXDIG
event-line = event-name SP request-id SP request-state SP mrcp-version CRLF
event-name = synthesizer-event / recognizer-event
-failed-uri = "Failed-URI:" Url CRLF
+failed-uri = "Failed-URI:" absoluteURI CRLF
failed-uri-cause = "Failed-URI-Cause:" 1*ALPHA CRLF
fetch-hint = "Fetch-Hint:" 1*ALPHA CRLF
fetch-timeout = "Fetch-Timeout:" 1*DIGIT CRLF
-field-content =  and consisting of either *TEXT or combinations of token
-field-name = token
-field-value = *( field-content / LWS )
-generic-header = active-request-id-list / proxy-sync-id / content-id / content-type / content-length / content-base / content-location / content-encoding / cache-control / logging-tag
+generic-header = active-request-id-list / proxy-sync-id / content-id / Content-Type / content-length / content-base / content-location / content-encoding / cache-control / logging-tag
generic-message = start-line message-header CRLF [ message-body ]
+hex4 = 1*4HEXDIG
+hexpart = hexseq / ( hexseq "::" [ hexseq ] ) / ( "::" [ hexseq ] )
+hexseq = hex4 *( ":" hex4 )
+hier-part = ( net-path / abs-path ) [ "?" query ]
+host = hostname / IPv4address / IPv6reference
+hostname = *( domainlabel "." ) toplabel [ "." ]
+hostport = host [ ":" port ]
jump-target = "Jump-Size:" speech-length-value CRLF
kill-on-barge-in = "Kill-On-Barge-In:" boolean-value CRLF
logging-tag = "Logging-Tag:" 1*ALPHA CRLF
+mark = "-" / "_" / "." / "!" / "~" / "*" / "'" / "(" / ")"
+media-type = type "/" subtype *( ";" parameter )
+message-body = *OCTET
message-header = 1*( generic-header / resource-header )
method-name = synthesizer-method / recognizer-method
mrcp-version = "MRCP/" 1*DIGIT "." 1*DIGIT
n-best-list-length = "N-Best-List-Length:" 1*DIGIT CRLF
+net-path = "//" authority [ abs-path ]
new-audio-channel = "New-Audio-Channel:" boolean-value CRLF
no-input-timeout = "No-Input-Timeout:" 1*DIGIT CRLF
numeric-speech-length = ( "+" / "-" ) 1*DIGIT SP numeric-speech-unit
numeric-speech-unit = "Second" / "Word" / "Sentence" / "Paragraph"
+opaque-part = uric-no-slash *uric
+param = *pchar
+parameter = attribute "=" value
+password = *( unreserved / escaped / "&" / "=" / "+" / "$" / "," )
+path-segments = segment *( "/" segment )
+pchar = unreserved / escaped / ":" / "@" / "&" / "=" / "+" / "$" / ","
+port = 1*DIGIT
+prosody-param-name = 1*ALPHA
+prosody-param-value = 1*alphanum
prosody-parameter = "Prosody-" prosody-param-name ":" prosody-param-value CRLF
proxy-sync-id = "Proxy-Sync-Id:" 1*ALPHA CRLF
+qdtext = LWS / "!" / %x23-5B / %x5D-7E / UTF8-NONASCII
+query = *uric
+quoted-pair = "" ( %x00-09 / %x0B-0C / %x0E-7F )
+quoted-string = SWS DQUOTE *( qdtext / quoted-pair ) DQUOTE
recognition-timeout = "Recognition-Timeout:" 1*DIGIT CRLF
recognizer-context-block = "Recognizer-Context-Block:" 1*ALPHA CRLF
-recognizer-event = START-OF-SPEECH / RECOGNITION-COMPLETE
+recognizer-event = "START-OF-SPEECH" / "RECOGNITION-COMPLETE"
recognizer-header = confidence-threshold / sensitivity-level / speed-vs-accuracy / n-best-list-length / no-input-timeout / recognition-timeout / waveform-url / completion-cause / recognizer-context-block / recognizer-start-timers / vendor-specific / speech-complete-timeout / speech-incomplete-timeout / dtmf-interdigit-timeout / dtmf-term-timeout / dtmf-term-char / fetch-timeout / failed-uri / failed-uri-cause / save-waveform / new-audio-channel / speech-language
-recognizer-method = SET-PARAMS / GET-PARAMS / DEFINE-GRAMMAR / RECOGNIZE / GET-RESULT / RECOGNITION-START-TIMERS / STOP
+recognizer-method = "SET-PARAMS" / "GET-PARAMS" / "DEFINE-GRAMMAR" / "RECOGNIZE" / "GET-RESULT" / "RECOGNITION-START-TIMERS" / "STOP"
recognizer-start-timers = "Recognizer-Start-Timers:" boolean-value CRLF
+reg-name = 1*( unreserved / escaped / "$" / "," / ";" / ":" / "@" / "&" / "=" / "+" )
+rel-path = rel-segment [ abs-path ]
+rel-segment = 1*( unreserved / escaped / ";" / "@" / "&" / "=" / "+" / "$" / "," )
+relativeURI = ( net-path / abs-path / rel-path ) [ "?" query ]
request-id = 1*DIGIT
request-line = method-name SP request-id SP mrcp-version CRLF
request-state = "COMPLETE" / "IN-PROGRESS" / "PENDING"
+reserved = ";" / "/" / "?" / ":" / "@" / "&" / "=" / "+" / "$" / ","
resource-header = recognizer-header / synthesizer-header
-response-line = mrcp-version SP request-id SP status-code SP request-state CRLF
save-waveform = "Save-Waveform:" boolean-value CRLF
+scheme = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )
+segment = *pchar *( ";" param )
sensitivity-level = "Sensitivity-Level:" 1*DIGIT CRLF
speak-length = "Speak-Length:" speech-length-value CRLF
speak-restart = "Speak-Restart:" boolean-value CRLF
-speaker-profile = "Speaker-Profile:" uri CRLF
+speaker-profile = "Speaker-Profile:" absoluteURI CRLF
+speech-complete-timeout = "Speech-Complete-Timeout:" 1*DIGIT CRLF
+speech-incomplete-timeout = "Speech-Incomplete-Timeout:" 1*DIGIT CRLF
speech-language = "Speech-Language:" 1*ALPHA CRLF
speech-length-value = numeric-speech-length / text-speech-length
speech-marker = "Speech-Marker:" 1*ALPHA CRLF
speed-vs-accuracy = "Speed-Vs-Accuracy:" 1*DIGIT CRLF
-start-line = request-line / response-line / event-line
+srvr = [ [ userinfo "@" ] hostport ]
+start-line = request-line / status-line / event-line
+status-code = 1*DIGIT
+status-line = mrcp-version SP request-id SP status-code SP request-state CRLF
+subtype = token
synthesizer-event = "SPEECH-MARKER" / "SPEAK-COMPLETE"
synthesizer-header = jump-target / kill-on-barge-in / speaker-profile / completion-cause / voice-parameter / prosody-parameter / vendor-specific / speech-marker / speech-language / fetch-hint / audio-fetch-hint / fetch-timeout / failed-uri / failed-uri-cause / speak-restart / speak-length
synthesizer-method = "SET-PARAMS" / "GET-PARAMS" / "SPEAK" / "STOP" / "PAUSE" / "RESUME" / "BARGE-IN-OCCURRED" / "CONTROL"
text-speech-length = 1*ALPHA SP "Tag"
+token = 1*( alphanum / "-" / "." / "!" / "%" / "*" / "_" / "+" / "`" / "'" / "~" )
+toplabel = ALPHA / ( ALPHA *( alphanum / "-" ) alphanum )
+type = token
+unreserved = alphanum / mark
+uric = reserved / unreserved / escaped
+uric-no-slash = unreserved / escaped / ";" / "?" / ":" / "@" / "&" / "=" / "+" / "$" / ","
+user = 1*( unreserved / escaped / user-unreserved )
+user-unreserved = "&" / "=" / "+" / "$" / "," / ";" / "?" / "/"
+userinfo = user [ ":" password ] "@"
+value = token / quoted-string
+vendor-av-pair-name = 1*ALPHA
+vendor-av-pair-value = 1*alphanum
vendor-specific = "Vendor-Specific-Parameters:" vendor-specific-av-pair *( ";" vendor-specific-av-pair ) CRLF
vendor-specific-av-pair = vendor-av-pair-name "=" vendor-av-pair-value
+voice-param-name = 1*ALPHA
+voice-param-value = 1*alphanum
voice-parameter = "Voice-" voice-param-name ":" voice-param-value CRLF
-waveform-url = "Waveform-URL:" Url CRLF
+waveform-url = "Waveform-URL:" absoluteURI CRLF

[Ballot discuss]
No Security Considerations section.

I didn't read this closely, but it appears that the only authentication mechanism is a password in a URI, i.e., a clear-text password.

[Ballot discuss]
Missing security considerations and IANA considerations sections.

I don't quite understand if the application/mrcp content, which looks like XML to me, is a normative part of this specification.  If it is, a normative reference to the appropriate W3C XML specifications needs to be added.

Where is the application/mrcp MIME type registered?  It's not in the IANA registry now, and I don't see a template in the document.

[Ballot discuss]
Missing security considerations and IANA considerations sections.

I don't quite understanbd if the application/mrcp content, which looks like XML to me, is a normative part of this specification.  If it is, a normative reference to the appropriate W3C XML specifications needs to be added.

Where is the application/mrcp MIME type registered?  It's not in the IANA registry now, and I don't see a template in the document.