Copyright Β© 2025 , Society of Motion Picture and Television Engineers . All rights reserved. No part of this material may be reproduced, by any means whatsoever, without the prior written permission of the Society of Motion Picture and Television Engineers.
The Society of Motion Picture and Television Engineers (SMPTE) is an internationally-recognized standards developing organization. Headquartered and incorporated in the United States of America, SMPTE has members in over 80 countries on six continents. SMPTEβs Engineering Documents, including Standards, Recommended Practices, and Engineering Guidelines, are prepared by SMPTEβs Technology Committees. Participation in these Committees is open to all with a bona fide interest in their work. SMPTE cooperates closely with other standards-developing organizations, including ISO, IEC and ITU. SMPTE Engineering Documents are drafted in accordance with the rules given in its Standards Operations Manual. For more information, please visit www.smpte.org .
This Standards Administrative Guideline forms an adjunct to the use and interpretation of the SMPTE Standards Operations Manual. In the event of a conflict, the Operations Manual shall prevail.
This Administrative Guideline defines the numbering format for SMPTE Engineering Documents and specifies the permitted file formats used during document development and publication. It also specifies other matters relating to SMPTE Engineering Documents with regard to language, style, format, document type, markups required at various stages of development, etc.
Files that show the differences between two versions of the same document are called "markups" in this Administrative Guideline. "Markup" is intended to cover a variety of terms including: "redline," "tracked changes," "blackline," etc.
The following keywords have a specific meaning in the context of this document:
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
No terms and definitions are listed in this document.
All SMPTE Engineering documents shall be written in U. S. English. Translations into other languages by SMPTE (or by 3rd parties authorized by SMPTE) are encouraged but not required. In the event of discrepancy, the original English language document shall be authoritative.
All Engineering Documents should follow the guidelines of the ISO/IEC Directives, Part 2 with the following exceptions: In the event of a conflict, explicit provisions of SMPTE Standards Operations Manual and Administrative Guidelines shall prevail. Any variances from the ISO/IEC Directives, Part 2 shall be approved by the Director of Engineering or the Standards Vice President.
Particular attention should be given to the following annexes of the ISO/IEC Directives, Part 2 :
The ISO Directives are available at: http://www.iso.org/directives .
All
Engineering
Documents
shall
use
SMPTE
AG-26
and
SMPTE
AG-27
as
of
2025-06-01
.
Prior to being submitted for pre-FCD ballot review, draft Engineering Documents may use other editing formats, as selected by the Project Group.
For a revision of an Engineering Document, if not already published in HTML, the Publication Master can usually can be obtained from SMPTE HQ. The Project Group should recreate the original document, as closely as possible to published, in HTML format as per SMPTE AG-26 , prior to any revision work to be done. This will ensure the tooling can create a proper redline document during the balloting process.
NOTE 1 ββ Care should be given when updating the tooling from prior HTML published versions, as major changes in said tooling may have occured. However, such changes may be required, such as general boiler plate verbiage, template update, and/or validation tools.
NOTE 2 ββ Since the HTML pipeline has been introduced, amendments are no longer able to be generated, only full revisions. As such, amendments shall no longer be utilized.
SMPTE Engineering Documents shall be published in HTML and may comprise one or more separate elements. An Engineering Document always shall include a single prose element and may include other elements such as XML, spreadsheets, media files, and so forth. The collection of elements, regardless of formats employed, is the "Engineering Document" as a whole, and all elements shall be clearly identified in the prose element (see 10.4 ). Any change to any element constitutes a change to the Engineering Document. The Project Group and the Technology Committee shall determine the number of elements for publication. The Director of Engineering shall determine the distribution media for all published documents. The format of publication shall alter neither the relevance of, nor the processes that otherwise are required for approval of, an Engineering Document.
Engineering Document Elements may be packaged as one or more Elements using ZIP to facilitate the organization and distribution of the component files.
With the exception of figures, the main element shall be submitted as a single HTML document, as specified at SMPTE AG-26 .
Images referenced in the main element shall use one of the following formats:
image/jpeg
,
as
specified
at
IANA
Media
Types
image/svg+xml
,
as
specified
at
IANA
Media
Types
image/png
,
as
specified
at
IANA
Media
Types
An
editable
master
shall
be
provided
for
each
image
in
a
format
other
than
image/svg+xml
.
The
editable
master
shall
be
in
one
of
the
following
formats:
application/vnd.openxmlformats-officedocument.wordprocessingml.document
as
specified
at
IANA
Media
Types
application/vnd.openxmlformats-officedocument.presentationml.presentation
,
as
specified
at
IANA
Media
Types
Additional elements may be provided in any format that is specified in a Permitted Normative References, as defined in SMPTE AG-03 , and for which a media type exists, as specified at IANA Media Types .
The file name extension for each additional element shall conform to the convention specified at IANA Media Types .
The Director of Engineering shall store and process documents in the format chosen by a Project Group and/or Technology Committee. The Director of Engineering shall ensure that copies of the editable source documents are maintained for all published Engineering Documents. The editable publication master should be made available by the Director of Engineering when a Revision or Amendment project is started.
Normative information in a SMPTE Engineering Document may take the language form of prose, tables, figures, formal languages (e.g., mathematical formulae, BNF, XML, pseudo code), and other language forms. Mathematical formulae shall follow the definitions documented in ISO 80000-2 when possible. When ISO 80000-2 is not sufficient (e.g., BNF, XML Schema, etc.), a Normative Reference for the mathematical definitions used shall be provided. Such Normative Reference shall comply with the provisions of the SMPTE Standards Operations Manual and SMPTE AG-03 .
When language forms other than prose are present, the prose shall state whether the language is normative or informative. Normative provisions shall be enabled explicitly (e.g., "The dimensions of figure 1 shall be used."). The presence of non-prose information without prose conformance language shall be deemed informative.
In
accordance
with
ISO
8601
,
all
dates
shall
be
represented
in
the
form
YYYY-MM-DD
as
numeric
digits
(e.g.
2009-04-23
to
indicate
April
23,
2009).
Document
numbers
shall
be
unique
and
uniform
across
all
Engineering
Document
types.
Versions
of
documents
shall
be
identified
by
the
year
and
month
of
their
approval
date,
appended
with
a
separating
colon
(e.g.,
for
document
#1020:
1020:2009-04
indicating
approval
in
April,
2009).
Figure
1
shows
an
example
of
the
document
numbering
structure.
The
approval
date
of
a
document
indicates
when
it
was
last
approved
by
its
consensus
body,
e.g.,
Technical
Committee.
The Director of Engineering shall assign document numbers (or root document numbers, in the case of multipart documents). Document numbers may be assigned at the request of the Technology Committee Chair(s) at any time after a Project is approved and shall be assigned before a Final Committee Draft ballot is issued.
Older Engineering Documents may bear one-, two-, or three-digit document numbers or root document numbers. These numbers shall not be prepended with leading zeroes when formatted for printing, either in the document itself or in citations in other documents. Such document numbers shall be prepended with leading zeroes to fill them out to four digits, however, when used as part of an elementβs filename; the purpose is to facilitate sorting into numerical order.
The Type of Engineering Document (Standard, Recommended Practice or Engineering Guideline) shall be denoted by prepending a Type Designator, followed by a single space, to the documentβs root number. The Type Designator shall be as follows:
Although they are not Engineering Documents, Registered Disclosure Documents, Advisory Notes, Administrative Guidelines, and Engineering Reports shall bear Type Designators as follows:
RDDs and ERs shall be numbered using independent number spaces. The numbers shall be assigned by SMPTE Headquarters staff.
Closely
related
Engineering
Documents
may
be
created
as
Parts.
A
Part
of
a
document
is
a
separate
Engineering
Document
and
shall
be
shown
to
be
related
to
other
by
using
the
same
root
document
number
plus
a
suffix
of
a
hyphen
and
the
Part
number
to
distinguish
among
Parts
(e.g.
1020-2:2009-04
,
indicating
document
1020,
Part
2).
A
multipart
set
of
documents
may
include
Parts
of
different
types
of
Engineering
Documents,
including
Standards,
Recommended
Practices,
and
Engineering
Guidelines.
Each
Partβs
number
shall
include
the
appropriate
document
type
designation
(e.g.
RP
2046-2:2009-04
).
A multipart set of documents should be supplemented by an informative Part 0, informally described as an βOverview Document,β which shall describe the relationships among the Parts and may describe the relationships of the Parts to other Engineering Documents. Part 0 documents are not due process Engineering Documents;
Part 0 documents usually should be prepared by the authors of the related engineering documents in cooperation with SMPTE headquarters staff and the responsible Technology Committee and Project Group. Part 0 documents shall be maintained by the Director of Engineering in consultation with the Technology Committee Chair(s) and the author(s) of the Part 0 document. If new Parts are added to a multipart set, or if any of the Parts of the set are revised, Part 0 shall be revised at the same time. The Part 0 designation shall not be used for any Engineering Document. Part 0 documents shall not bear a Type designator (i.e. it is not an ST, RP or EG).
A Part 0 document should not contain forward-looking statements in regard to documents that are not ready for publication.
As a general guideline, Part 0 documents should use the following structure:
Examples of Part 0 documents: SMPTE 2052-0 or SMPTE 425-0.
Normative references to multipart documents always shall specify the individual Part or Parts being referenced and shall not reference the entire set by root number alone.
Non-prose
Elements
of
Engineering
Documents
(see
Clause
7
)
shall
be
designated
using
a
lower
case
letter
(e.g.
1020a:2009-04
and
1020b:2009-04
).
Media
such
as
DVDs,
as
well
as
non-PDF
formats,
shall
be
clearly
marked,
as
appropriate.
The
single
prose
element
shall
not
receive
aletter
suffix.
All new Engineering Documents shall share a common root number space, starting with 2000, except for new Parts of multipart documents that have a one-, two- or three-digit root.
In the past, each type of Engineering Document had its own number space. This presented difficulties when a Technology Committee determined that the document type had to be changed (for example, changing a Recommended Practice to a Standard) if the number in the new number space already was in use. To address this going forward, the block of numbers from 1000 to 1999 has been allocated.
If a Technology Committee determines that the classification of an Engineering Document with a one-, two- or three-digit root must be changed (e.g., from a Recommended Practice to a Standard) and there already is an Engineering Document with that number, the document whose classification is being changed shall have 1000 added to its root. For example, if the Technology Committee were to determine that Recommended Practice RP 222 should be changed to a Standard, its number would be changed to SMPTE ST 1222 because there already is a SMPTE ST 222.
Each of the other published document types (i.e., Registered Disclosure Documents, Advisory Notes, Administrative Guidelines, and Engineering Reports) shall have its own number space independent of Engineering Documents and of each other. They otherwise shall follow the rules for document numbering specified in this Administrative Guideline.
File names for due process Engineering Documents should be constructed as follows.
<group> β-β <state> β-β <type> β-β <number> [ β-β <part> ] [ <element> ] β-β <description> β-β <date> [ β(β <note> β)β ] β.β <extension>
Where:
<group>
<state>
<type>
<number>
<part>
<element>
<description>
<date>
<note>
<note>
shall
be
constructed
using
only
alpha
characters,
digits,
β-β.
<extension>
NOTE
ββ
The
<description>
and
<note>
fields
can
use
CamelCase
or
hyphens
as
word
separators.
The
Document
Editor
and
Project
Chair
need
to
consider
both
choices
and
make
a
decision
based
on
the
project
name,
any
acronyms
used,
the
length
of
the
name
and
related
factors.
The Project Group should follow the recommendation in this section or the requirements in Clause 10 . The final publication name shall be assigned by the Director of Engineering.
Elements that are a collection of files shall be aggregated into a single file that is a .zip file. The .zip file may contain other .zip files if necessary. The file name for the .zip file shall follow the rules outlined in 11.2 . The names of the files in the .zip file shall be at the discretion of the Project Group. The Project Group may use the schemes defined in this AG. They should use a scheme that is appropriate for the files in the element.
File
names
for
contributions
that
are
not
Engineering
Documents
shall
be
at
the
discretion
of
the
individual
or
group
making
the
contribution.
The
scheme
in
11.1
should
be
considered
as
a
useful
model.
If
these
rules
are
used,
the
<state>
should
be
βC.β
For a new project, the document number and even the project short name may not be known. In this event, individuals making the contributions should use their judgment when naming files.
Various document packages are needed during the development process. In all cases, a document being reviewed or voted upon shall be the current draft which is the βcleanβ version, generated in zip file within the GitHub release as described in SMPTE AG-26 . All the below described packages are auto-generated by this tooling and shall not be created by hand.
In the event that any of the following is in conflict with the SMPTE Standards Operations Manual , the SMPTE Standards Operations Manual shall prevail.
Clause 6 of this AG has guidance for the use of templates for new projects and Revisions.
For Revisions the process of converting an old document into the current template changes section numbering and alters the appearance of the original document, even though the content of the document has not changed. In this case, it is recommended that the conversion to the current template should be made before any other changes are made. The document editor should βaccept all changesβ to create a clean starting point (the βbaseline draftβ) from which to track the technical and/or editorial revisions to the document.
During Working Draft development (an informal process), a Project Group may provide intermediate draft documents and markups for review within the Project Group. Intermediate document packages may include an informal Comment Resolution Record or a Comment Resolution Document.
The state of these draft documents shall be βWD.β Project Groups should follow the recommendations and styles given in this Administrative Guideline for file names.
The first step in the formal document process is the preparation of a Working Draft, which shall be marked as βWD.β This document a package is provided by the Project Group to the Technology Committee Chair(s). This review is optional; See SMPTE Standards Operations Manual for guidance.
The document package shall contain a clean draft. In addition it may contain one of the following:
Following Pre-Ballot Review, a Project Group should address all comments. See the comment resolution process in SMPTE Standards Operations Manual . When the Project Group agrees that the document is ready for ballot, it shall provide a Committee Draft ballot package marked as βCDβ to the Technology Committee Chairs(s) that contains:
When additional Final Committee Draft Ballot(s) are required, the Project Group shall submit a package to the Technology Committee Chair(s) that contains the following:
A Comment Resolution Record is required when there are additional FCD Ballot(s). This should be the electronic comment resolution records kept on the SMPTE SKN Balloting App. In some situations the Project Group may wish to keep other records. See SMPTE Standards Operations Manual for guidance.
NOTE ββ If a document passes Final Committee Draft ballot with no comments, comment resolution, Pre-DP Review and a Draft Publication Vote are not required. See SMPTE Standards Operations Manual for guidance.
Incremental Comment Resolution within the Project Group may result in the need for multiple Drafts, Markups, and Comment Resolution Records or Comment Resolution Documents. These document packages shall contain:
A Comment Resolution Record is required. This should be the electronic comment resolution records kept on the SMPTE SKN Balloting App. In some situations the Project Group may wish to keep other records. See SMPTE Standards Operations Manual for guidance.
When Comment Resolution has been successfully completed, a Pre-DP Review follows. Comment resolution may include one or more Disposition Votes. See SMPTE Standards Operations Manual for guidance.
Following comment resolution, the Project Group shall provide the Technology Committee Chair(s) a Pre-DP review package that contains:
A Comment Resolution Record is required. This should be the electronic comment resolution records kept on the SMPTE SKN Balloting App. In some situations the Project Group may wish to keep other records. See SMPTE Standards Operations Manual for guidance.
Following the Pre-DP Review, the Project Group shall provide the Technology Committee Chair(s) a DP Vote package that contains:
A Comment Resolution Record is required. This should be the electronic comment resolution records kept on the SMPTE SKN Balloting App. In some situations the Project Group may wish to keep other records. See SMPTE Standards Operations Manual for guidance.
After a successful DP vote the Draft Publication Vote Package documents shall not be edited by the Project Group participants or the Technology Committee Chair(s) with the exception of changing the document status. If new editorial issues are found, these should be documented and given to SMPTE HQ (see 12.9 ).
This document package is the responsibility of the Technology Committee Chair(s) and shall contain:
A Comment Resolution Record is required. This should be the electronic comment resolution records kept on the SMPTE SKN Balloting App. If the Project Group kept other records, these must be included. See SMPTE Standards Operations Manual for guidance.
The Technology Committee Chair(s) shall provide a document package to SMPTE HQ that includes:
manifest.json
file
as
defined
in
SMPTE
AG-28
.
NOTE ββ After each document achieves a successful ST Audit, SMPTE staff will prepare it for publication. The Technology Committee Chairs(s), Project Group Chairs(s) and Document Editor(s) who are responsible for the document are expected to review and approve it before publication.
Registered Disclosure Documents (RDDs) are not Engineering Documents. The RDD approval process includes a Technology Committee Ballot, Comment Resolution and an ST Audit.
Using the content and form of the appropriate Engineering Document packages is recommended.