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Thanks Mo.  Do you have an application that uses subgroup IDs with specific
semantic values that would break if this change were adopted?  Can you
explain how it works?

Thanks

-Alan

On Mon, Apr 27, 2026 at 7:43=E2=80=AFAM Mo Zanaty (mzanaty) <mzanaty=3D
40cisco.com@dmarc.ietf.org> wrote:

> 1608 is a major change to the core data model that makes subgroups
> semantically meaningless, as they would encode transport irregularities
> that destroy the app=E2=80=99s semantic meaning. A primary driver for ado=
pting
> subgroups was video with scalable
>=20
> 1608 is a major change to the core data model that makes subgroups
> semantically meaningless, as they would encode transport irregularities
> that destroy the app=E2=80=99s semantic meaning. A primary driver for ado=
pting
> subgroups was video with scalable layers where the subgroup ID identified
> the layer. 1608 essentially removes subgroup ID, so there is no way to
> identify layers using MOQT alone. LOC originally embedded layer identifie=
rs
> but removed this when MOQT added subgroups. I still think this was the
> right direction to have generally consistent semantics across apps at the
> core MOQT level data model.
>
> I agree it is useful (essential in some cases) to know if an object starts
> a subgroup. This can be indicated in the subgroup header using different
> type values for start of subgroup vs continued subgroup. IMO, that is a
> much better solution than changing the core data model.
>
> Thanks,
> Mo
>
>
> ------------------------------
> *From:* Alan Frindell <afrind=3D40meta.com@dmarc.ietf.org>
> *Sent:* Friday, April 24, 2026 9:26:30 PM
> *To:* Martin Duke <martin.h.duke@gmail.com>
> *Cc:* MOQ Mailing List <moq@ietf.org>
> *Subject:* [Moq] Re: Monday's agenda is ready
>
> The slides are posted here:
> https://datatracker.ietf.org/meeting/interim-2026-moq-14/materials/slides=
-interim-2026-moq-14-sessa-moqt-prs-and-issues-00
> <https://urldefense.com/v3/__https://datatracker.ietf.org/meeting/interim=
-2026-moq-14/materials/slides-interim-2026-moq-14-sessa-moqt-prs-and-issues=
-00__;!!Bt8RZUm9aw!6Cj0bahZSaSnjCSoCic4PZ127U8j60vM1-X0VMHDDposAkJ44vKRz8bn=
-umkD9QdQAvUK9C3nMR8C0amg7fvu_y9vhU$>
>
> We're still waiting on some content so look for an update, or new slides
> from Victor on his Delivery Timeout proposal and Required Request ID
> Alternate.
>
> Reading up on the issues/slides in advance will help us maximize our
> discussion time.
>
> #1608 Make Subgroup ID identical to first Object Id in the Subgroup
>
> #1519/#1603 Required Request ID
>
> #1613 Add MAX_REQUEST_UPDATES setup option and TOO_MANY_REQUEST_UPDATES
> error
>
> #1605 Split DELIVERY_TIMEOUT into two types of timeout
>
> Was it a mistake to require negotiation for unknown params
> <https://urldefense.com/v3/__https://mailarchive.ietf.org/arch/msg/moq/C-=
pytBAJowMXwQdtTDGN1zgis7Q/__;!!Bt8RZUm9aw!6Cj0bahZSaSnjCSoCic4PZ127U8j60vM1=
-X0VMHDDposAkJ44vKRz8bn-umkD9QdQAvUK9C3nMR8C0amg7fvcggVovQ$>
> ?
>
> Time Permitting
>
>  - Going through open Joining FETCH Dissent issues.  Slides are there.
>
> Thanks
>
> -Alan
>
> On Wed, Apr 22, 2026 at 7:42=E2=80=AFPM Martin Duke <martin.h.duke@gmail.=
com>
> wrote:
>
> You can find it on datatracker. It's all editor time. Alan, please post
> issue slides. =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D=
 =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=
=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=
=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =
=E2=80=8D =E2=80=8D =E2=80=8D
> =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=
=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=
=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =
=E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=
=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=
=8D =E2=80=8D
> =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=
=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=
=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =
=E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=
=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=
=8D =E2=80=8D
> =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=
=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=
=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =
=E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=
=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=
=8D =E2=80=8D
> =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D
> You can find it on datatracker. It's all editor time.
>
> Alan, please post issue slides.
> --
> Moq mailing list -- moq@ietf.org
> To unsubscribe send an email to moq-leave@ietf.org
>
>

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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-size:large">Tha=
nks Mo.=C2=A0 Do you have an application that uses subgroup IDs with specif=
ic semantic values that would break if this change were adopted?=C2=A0 Can =
you explain how it works?</div><div class=3D"gmail_default" style=3D"font-s=
ize:large"><br></div><div class=3D"gmail_default" style=3D"font-size:large"=
>Thanks</div><div class=3D"gmail_default" style=3D"font-size:large"><br></d=
iv><div class=3D"gmail_default" style=3D"font-size:large">-Alan</div></div>=
<br><div class=3D"gmail_quote gmail_quote_container"><div dir=3D"ltr" class=
=3D"gmail_attr">On Mon, Apr 27, 2026 at 7:43=E2=80=AFAM Mo Zanaty (mzanaty)=
 &lt;mzanaty=3D<a href=3D"mailto:40cisco.com@dmarc.ietf.org">40cisco.com@dm=
arc.ietf.org</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" styl=
e=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);paddin=
g-left:1ex"><div class=3D"msg2990804879290895976">

<div style=3D"font-size:1px;color:rgb(255,255,255);line-height:1px;max-heig=
ht:0px;opacity:0;overflow:hidden;display:none">
1608 is a major change to the core data model that makes subgroups semantic=
ally meaningless, as they would encode transport irregularities that destro=
y the app=E2=80=99s semantic meaning. A primary driver for adopting subgrou=
ps was video with scalable</div>



<div style=3D"font-size:1px;color:rgb(255,255,255);line-height:1px;max-heig=
ht:0px;opacity:0;overflow:hidden;display:none"></div>











<div>
<div dir=3D"ltr" style=3D"font-family:Aptos,Aptos_MSFontService,-apple-syst=
em,Roboto,Arial,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">
1608 is a major change to the core data model that makes subgroups semantic=
ally meaningless, as they would encode transport irregularities that destro=
y the app=E2=80=99s semantic meaning. A primary driver for adopting subgrou=
ps was video with scalable layers where
 the subgroup ID identified the layer. 1608 essentially removes subgroup ID=
, so there is no way to identify layers using MOQT alone. LOC originally em=
bedded layer identifiers but removed this when MOQT added subgroups. I stil=
l think this was the right direction
 to have generally consistent semantics across apps at the core MOQT level =
data model.</div>
<div dir=3D"ltr" style=3D"font-family:Aptos,Aptos_MSFontService,-apple-syst=
em,Roboto,Arial,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">
<br>
</div>
<div dir=3D"ltr" style=3D"font-family:Aptos,Aptos_MSFontService,-apple-syst=
em,Roboto,Arial,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">
I agree it is useful (essential in some cases) to know if an object starts =
a subgroup. This can be indicated in the subgroup header using different ty=
pe values for start of subgroup vs continued subgroup. IMO, that is a much =
better solution than changing the
 core data model.=C2=A0</div>
<div dir=3D"ltr" style=3D"font-family:Aptos,Aptos_MSFontService,-apple-syst=
em,Roboto,Arial,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">
<br>
</div>
<div dir=3D"ltr" style=3D"font-family:Aptos,Aptos_MSFontService,-apple-syst=
em,Roboto,Arial,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">
Thanks,</div>
<div dir=3D"ltr" style=3D"font-family:Aptos,Aptos_MSFontService,-apple-syst=
em,Roboto,Arial,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">
Mo</div>
<div dir=3D"ltr" style=3D"font-family:Aptos,Aptos_MSFontService,-apple-syst=
em,Roboto,Arial,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">
<br>
</div>
<div id=3D"m_2990804879290895976ms-outlook-mobile-body-separator-line" dir=
=3D"ltr" style=3D"font-family:Aptos,Aptos_MSFontService,-apple-system,Robot=
o,Arial,Helvetica,sans-serif;font-size:12pt">
<div dir=3D"ltr" style=3D"font-family:Aptos,Aptos_MSFontService,-apple-syst=
em,Roboto,Arial,Helvetica,sans-serif;font-size:12pt">
<br>
</div>
</div>
<div style=3D"font-family:Aptos,Aptos_MSFontService,-apple-system,Roboto,Ar=
ial,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)" dir=3D"ltr" id=3D=
"m_2990804879290895976ms-outlook-mobile-signature">
</div>
<hr style=3D"display:inline-block;width:98%">
<div id=3D"m_2990804879290895976divRplyFwdMsg" dir=3D"ltr"><font face=3D"Ca=
libri, sans-serif" style=3D"font-size:11pt" color=3D"#000000"><b>From:</b> =
Alan Frindell &lt;afrind=3D<a href=3D"mailto:40meta.com@dmarc.ietf.org" tar=
get=3D"_blank">40meta.com@dmarc.ietf.org</a>&gt;<br>
<b>Sent:</b> Friday, April 24, 2026 9:26:30 PM<br>
<b>To:</b> Martin Duke &lt;<a href=3D"mailto:martin.h.duke@gmail.com" targe=
t=3D"_blank">martin.h.duke@gmail.com</a>&gt;<br>
<b>Cc:</b> MOQ Mailing List &lt;<a href=3D"mailto:moq@ietf.org" target=3D"_=
blank">moq@ietf.org</a>&gt;<br>
<b>Subject:</b> [Moq] Re: Monday&#39;s agenda is ready</font>
<div>=C2=A0</div>
</div>
<div>
<div dir=3D"ltr">
<div style=3D"font-size:large">The slides are posted here:=C2=A0<a href=3D"=
https://urldefense.com/v3/__https://datatracker.ietf.org/meeting/interim-20=
26-moq-14/materials/slides-interim-2026-moq-14-sessa-moqt-prs-and-issues-00=
__;!!Bt8RZUm9aw!6Cj0bahZSaSnjCSoCic4PZ127U8j60vM1-X0VMHDDposAkJ44vKRz8bn-um=
kD9QdQAvUK9C3nMR8C0amg7fvu_y9vhU$" target=3D"_blank">https://datatracker.ie=
tf.org/meeting/interim-2026-moq-14/materials/slides-interim-2026-moq-14-ses=
sa-moqt-prs-and-issues-00</a></div>
<div style=3D"font-size:large"><br>
</div>
<div style=3D"font-size:large">We&#39;re still waiting on some content so l=
ook for an update, or new slides from Victor on his Delivery Timeout propos=
al and Required Request ID Alternate.<br>
<br>
Reading up on the issues/slides in advance will help us maximize our discus=
sion time.</div>
<div style=3D"font-size:large"><br>
</div>
<div style=3D"font-size:large">#1608 Make Subgroup ID identical to first Ob=
ject Id in the Subgroup</div>
<div style=3D"font-size:large"><br>
#1519/#1603 Required Request ID<br>
<br>
#1613 Add MAX_REQUEST_UPDATES setup option and TOO_MANY_REQUEST_UPDATES err=
or<br>
<br>
#1605 Split DELIVERY_TIMEOUT into two types of timeout</div>
<div style=3D"font-size:large"><br>
Was it a mistake to require negotiation for <a href=3D"https://urldefense.c=
om/v3/__https://mailarchive.ietf.org/arch/msg/moq/C-pytBAJowMXwQdtTDGN1zgis=
7Q/__;!!Bt8RZUm9aw!6Cj0bahZSaSnjCSoCic4PZ127U8j60vM1-X0VMHDDposAkJ44vKRz8bn=
-umkD9QdQAvUK9C3nMR8C0amg7fvcggVovQ$" target=3D"_blank">
unknown params</a>?=C2=A0<br>
<br>
Time Permitting<br>
<br>
=C2=A0- Going through open Joining FETCH Dissent issues.=C2=A0 Slides are t=
here.<br>
<br>
Thanks</div>
<div style=3D"font-size:large"><br>
</div>
<div style=3D"font-size:large">-Alan</div>
</div>
<br>
<div>
<div dir=3D"ltr">On Wed, Apr 22, 2026 at 7:42=E2=80=AFPM Martin Duke &lt;<a=
 href=3D"mailto:martin.h.duke@gmail.com" target=3D"_blank">martin.h.duke@gm=
ail.com</a>&gt; wrote:<br>
</div>
<blockquote style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204=
,204,204);padding-left:1ex">
<div>
<div style=3D"font-size:1px;color:rgb(255,255,255);line-height:1px;max-heig=
ht:0px;opacity:0;overflow:hidden;display:none">
You can find it on datatracker. It&#39;s all editor time. Alan, please post=
 issue slides. =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =
=E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=
=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=
=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =
=E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=
=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=
=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =
=E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=
=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=
=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =
=E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=
=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D
 =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=
=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=
=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =
=E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=
=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=
=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =
=E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=
=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=
=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D =E2=80=8D</div>
<div style=3D"font-size:1px;color:rgb(255,255,255);line-height:1px;max-heig=
ht:0px;opacity:0;overflow:hidden;display:none">
</div>
<div dir=3D"ltr">You can find it on datatracker. It&#39;s all editor time.
<div><br>
</div>
<div>Alan, please post issue slides.</div>
</div>
-- <br>
Moq mailing list -- <a href=3D"mailto:moq@ietf.org" target=3D"_blank">moq@i=
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</div>
</blockquote>
</div>
</div>
</div>

</div></blockquote></div>

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