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2. Synchronized Multimedia Integration Language (SMIL) Modules

Editors:
Warner ten Kate (warner.ten.kate@philips.com), (Philips Electronics)
Ted Wugofski (ted.wugofski@corp.phone.com), (Phone.com)
Patrick Schmitz (pschmitz@microsoft.com), (Microsoft)

Table of contents

2.1 Introduction

This section is Normative.

Since the publication of SMIL 1.0 [SMIL10], interest in the integration of SMIL concepts with the HTML, the Hypertext Markup Language [HTML40], and other XML languages, has grown. Likewise, the W3C HTML Working Group is specifying how XHTML, the Extensible Hypertext Markup Language [XHTML10], can be subset, be extended, or be integrated with other languages. The strategy considered for integrating respective functionality with other XML languages is based on the concepts of modularization and profiling [MODMOD], [SMIL-MOD], [XMOD], [XPROF].

Modularization is a solution in which a language's functionality is partitioned into sets of semantically-related elements and attributes. Profiling is the combination of these feature sets to provide support for the functionality required within a particular application domain. The re-use of modules across profiles should enhance the interoperability between the various application domains.

This specification complies with the XHTML modularization conformance requirements as set forth in the XHTML Modularization specification [XMOD]. For the purposes of this specification we further define:

element
An element is a XML representation of a semantic feature. An element has one representation in any given namespace.
module
A module is a collection of semantically-related elements. Attributes and their value range may be divided over different modules.
module family
A module family is a collection of modules associated with the same namespace. Modules with related functionality are generally ordered in a module family by increasing functionality. Each module at a higher level requires all modules at the lower levels. Ideally, each element is in one and only one module family. Elements in different module families but representing the same semantic feature are said to be isomorphic.
The typical way of referring to elements from a certain module family is through their namespace. Examples are "XHTML" and "SMIL".
A module family is not to be confused with a language profile, which is defined below. However, a module family typically associates with a language profile, namely that language profile which uses (nearly) all modules and only modules from the module family.
A module family defines at least one module as mandatory for language profiles which wish to be part of the language-profile family (defined below) associated with that module family. That mandatory module is the so-called "Structure Module" and includes the document's root element (e.g., <html> and <smil>).
language profile
A language profile is a collection of modules particular to an application domain. For example, the "SMIL Language" profile corresponds to the collection of modules that make up for composition of multimedia presentations. Likewise, a "Timed-Text" language profile would correspond to the collection of modules for supporting timing of text content.
A language profile can include modules from different module families. This enables for the integration of functionality developed within different languages.
language profile family
A language profile family is a collection of language profiles which all share a common set of modules. The modules in that common set are defined as mandatory for that language profile family.
A special case are the so-called "Host Language" profiles [XMOD]. These are the language profiles which use all the mandatory modules defined by a module family. Those language profile families are typically referred to by the module family's namespace qualifier. Examples are "the XHTML language profile family" and "the SMIL language profile family". A language profile might use mandatory modules from different module families. As any language profile will have a single root element, the choice of Structure Module is decisive in assigning the language profile family name. A consequence of this is that, for example, a language profile may include modules used in the "SMIL Language", i.e. modules that are part from the "SMIL" module family, while the language profile may not be member of the "SMIL Language profile family". These profiles are called "Integration Set" in [XMOD]. "Integration Set" conformance differs from "Host Language" conformance in not requiring the inclusion of the (XHTML) Structure Module.

The main purpose of the notion of language profile family is to enhance interoperability. Language profiles within the same language profile family share the same MIME type(s). Preferably, the mandatory modules of a language profile family should be defined in such a way that any offered document conforming to a language profile in that language profile family will yield a reasonable presentation when the renderer, while supporting that language profile family's mandatory module set, would ignore all other (unknown) elements and attributes. Here, "reasonable presentation" is to be understood as something intelligible, which is not necessarily a close reflection of the author's original intentions. For that purpose a language profile negotiation would have to be conducted.

There is an important difference between the concepts of module family and language profile family. The first indicates the functionality space, and the second has to do with the document type (and MIME type). A language profile associates with one doctype, which is called the "host language". Therefore, the "Structure Module", containing the doctype's root element, is an essential module in any language profile family.

@@ In respect of decreasing document size: should the remainder of this section stay?

SMIL functionality is partitioned into modules based on the following design requirements:

  1. Ensure that a language profile may be defined that is completely backward compatibility with SMIL 1.0.
  2. Ensure that a module's semantics maintain compatibility with SMIL semantics (this includes content and timing).
  3. Partition into modules of reasonable granularity, to support wide reuse in an interoperable manner.
  4. Specify modules that are isomorphic with other modules based on W3C recommendations.
  5. Specify modules that can complement XHTML modules.
  6. Specify how the modules support the document object model.

The first requirement specifies that a collection of modules can be "recombined" in such a way as to be backwardly compatible with SMIL 1.0 (it will properly play SMIL 1.0 conforming content).

The second requirement specifies that the semantics of SMIL must not change when they are embodied in a module. Fundamentally, this ensures the integrity of the SMIL content and timing models. This is particularly relevant when a different syntax is required to integrate SMIL functionality with other languages.

The third requirement states that modules be of reasonable granularity. This requirement reflects the core purpose of modularization and profiling. On the one hand, the modularization should lead to separation of functionality, such that language profile designs can optimize for performance and complexity. On the other hand, the range of modules should be limited, such that interoperability is promoted.

The fourth requirement specifies that, where functionality overlaps, modules be isomorphic with other modules from other W3C recommendations. This will assist designers when sharing modules across language profiles.

The fifth requirement states that specific attention be paid to providing multimedia functionality to the XHTML language. XHTML is the reformulation of HTML in XML.

The sixth requirement ensures that modules have integrated support for the document object model. This facilitates additional control through scripting and user agents.

These requirements led to a partitioning of SMIL functionality into twenty five modules.

2.2 SMIL Modules

This section is Informative.

SMIL functionality is partitioned into nine functional areas. Within each functional area a further partitioning is applied into modules. The modules are complementary. For example, the Timing Level 2 Module adds syncBehavior to the timing in the Timing Level 0 and Level 1 Modules.

@@ This is a Normative statement !! When a language profile includes a module of a higher level, the modules of the lower levels MUST be included. Some elements or attributes are labeled as Profile Specific. This means that those elements or attributes are optional to the language profile, as long as the module from which they stem is the top level module.

The functional areas and the modules are:

  1. Timing functionality
    1. Timing Level 0 Module
    2. Timing Level 1 Module
    3. Timing Level 2 Module
  2. Time Manipulations functionality
    1. Time Manipulations Module
  3. Animation functionality
    1. Animation Level 0 Module
    2. Animation Level 1 Module
  4. Transition Effects functionality
    1. Transition Effects Level 0 Module
    2. Transition Effects Level 1 Module
  5. Media functionality
    1. Media Object Level 0 Module
    2. Media Object Level 1 Module
  6. Streaming Media functionality
    1. Streaming Media Level 0 Module
  7. Content Control functionality
    1. Content Control Level 0 Module
    2. Content Control Level 1 Module
  8. Metainformation functionality
    1. Metainformation Level 0 Module
  9. Structure functionality
    1. Structure Level 0 Module
  10. Layout functionality
    1. Layout Level 0 Module
    2. Layout Level 1 Module
    3. Layout Level 2 Module
  11. Linking functionality
    1. Linking Level 0 Module
    2. Linking Level 1 Module
  12. DOM functionality
    1. SMIL DOM Modules

Each of these modules introduces a set of semantically-related elements, properties, and attributes.

All these modules, and only these modules, are members of the SMIL module family. @@ This is a Normative statement ??

The Structure Level 0 Module, Timing Level 0 Module, and Media Object Level 0 Module are mandatory modules in any language profile in the SMIL language profile family. This implies that the SMIL Structure Level 0 Module must at least be accompanied with the two other modules. Those modules themselves can still be used in other, non-SMIL family, language profiles.

Below, the modules are listed.

@@ Need check on completeness.

@@ Need check on correct division over levels.

@@ The names for the script to generate hyperlinks to the element and attribute definitions need check on being identical.

2.3 Timing functionality

This section is Informative.

The Timing and Synchronization Modules provide a framework for describing timing structure, timing control properties, and temporal relationships between elements. The Timing and Synchronization Modules define semantics for par, seq, and excl elements. In addition, the modules define semantics for attributes including begin, dur, end, repeatCount, repeatDur, and others.

2.3.1 Timing Level 0 Module

Elements
par
seq
Attributes
begin (single time condition; long syncarc; with syncbase syntax; with prev; with wall clock; with offset)
end (single time condition; long syncarc; with syncbase syntax; with prev; with wall clock; with offset)
endsync
dur
repeat (deprecated)
repeatCount
repeatDur
timeAction
timeContainer

The Timing Level 0 Module is a mandatory module in any language profile in the SMIL language profile family.

Note that upon building a language profile which integrates SMIL timing with other, non-SMIL, modules, that the elements from this Timing Level 0 Module may appear as attributes to the elements from the other XML language, rather than as these elements themselves. In that case, the element's functionality is declared using the timeContainer attribute.

@@ To be moved to corresponding module
The timing attributes are used by the elements in this Timing Level 0 Module and in the other Timing Modules, and by the elements in the Media Modules, in the Linking Modules, and in the Content Control Modules. As upon integration with non-SMIL modules, the elements from this module may appear as attributes instead of elements, the referenced timing attributes are also used by those non-SMIL elements.

2.3.2 Timing Level 1 Module

Elements
excl
priorityClass
Attributes
begin (multiple time conditions; events)
end (multiple time conditions; events)
restart
restartDefault
fill

Usage of the Timing Level 1 Module requires inclusion of the Timing Level 0 Module. (@@ Therefore, should we design the modules as inclusive, rather than complementary?) Consequently, the same usage rules apply.

This means that upon integrating with a non-SMIL language, the excl element may appear as an attribute using the timeContainer construct. Another implication is that the added attributes (restart etc.) are adopted by the same elements who have adopted the attributes in the Timing Level 0 Module.

When this module is used it adds the 'multiple time conditions' and 'events' semantics to the begin and end attributes.

@@ To be moved to corresponding module
When this module is used it adds the restart, the restartDefault, the syncBehavior, and the syncBehaviorDefault attributes to the par, seq, and excl elements.

2.3.3 Timing Level 2 Module

Elements
<!-- NONE -->
Attributes
begin (with media markers)
end (with media markers)
syncMaster
syncTolerance
syncToleranceDefault
syncBehavior
syncBehaviorDefault

Usage of the Timing Level 2 Module requires inclusion of the Timing Level 0 Module and the Timing Level 1 Module. Consequently, the same usage rules apply.

@@ To be moved to corresponding module
When this module is used it adds the 'media marker' semantics to the begin and end attributes.

2.4 Time Manipulations functionality

This section is Informative.

2.4.1 Time Manipulations Module

Elements
<!-- NONE -->
Attributes
speed
accelerate
decelerate
autoReverse

2.5 Animation functionality

This section is Informative.

The Animation Modules provide a framework for incorporating animation onto a timeline (a timing model) and a mechanism for composing the effects of multiple animations (a composition model). The Animation Modules define semantics for the animate, set, animateMotion, and animateColor elements.

2.5.1 Animation Level 0 Module

Elements
animate (without keyTimes and keySplines)
set
animateMotion
animateColor
Attributes
targetElement
attributeName
attributeType
from
to
by
values
accumulate
additive
calcMode
path
origin

@@ To be moved to corresponding module
When this module is used, it adds the animate, set, animateMotion, and animateColor elements to the content model of the ref, animation, audio, img, video, text, and textstream elements of the Media Object Modules (if those are present in the language profile). It also adds these elements to the content model of the par, seq, and excl elements of the Timing Modules, and to the content model of the body element of the Structure Level 0 Module (if those are present in the language profile).

2.5.2 Animation Level 1 Module

Elements
<!-- NONE -->
Attributes
keyTimes
keySplines

Usage of the Animation Level 1 Module requires inclusion of the Animation Level 0 Module. Consequently, the same usage rules apply.

@@ To be moved to corresponding module
When this module is used it adds the keyTimes and keySplines attributes to the animate element.

2.6 Transition Effects functionality

This section is Informative.

The Transition Effects Modules define a taxonomy of transition effects as well as semantics and syntax for integrating these effects into XML documents.

2.6.1 Transition Effects Level 0 Module

Elements
transition (on single elements)
Attributes
transition
type
subtype
startPercent
endPercent
direction
horzRepeat
vertRepeat
borderWidth
color
multiElement
childrenClip

@@ To be moved to corresponding module
When this module is used, it adds the transition element to the content model of the layout element of the Layout Level 0 Module (if present in the language profile). The transition attribute is added to the elements in the Media Object Level 0 Module (if present in the language profile).

2.6.2 Transition Effects Level 1 Module

Elements
transition (on multi-element regions)
transitionFilter
Attributes
percentDone

Usage of the Transition Effects Level 1 Module requires inclusion of the Transition Effects Level 0 Module. Consequently, the same usage rules apply.
In addition, the usage of the Transition Effects Level 1 Module requires support for hierarchical layout, such as supported by the Layout Level 1 Module.

@@ To be moved to corresponding module
When this module is used it adds transition effects functionality for transitions over multiple regions.

2.7 Media functionality

This section is Informative.

The Media Object Modules provide a framework for declaring media. The Media Object Modules define semantics for the ref, animation, audio, img, video, text, and textstream elements.

2.7.1 Media Object Level 0 Module

Elements
ref
img
text
audio
video
animation
textstream
Attributes
abstract
alt
author
clipBegin (clip-begin)
clipEnd (clip-end)
copyright
longdesc
src
type

The Media Object Level 0 Module is a mandatory module in any language profile in the SMIL language profile family.

@@ To be moved to corresponding module
When this module is used, it adds the ref, animation, audio, img, video, text, and textstream elements to the content model of the par, seq, and excl elements of the Timing Modules (if those are present in the language profile). It also adds these elements to the content model of the body element of the Structure Level 0 Module (if those are present in the language profile). It also adds these elements to the content model of the a element of the Linking Modules (if those are present in the language profile).

2.7.2 Media Object Level 1 Module

Elements
Profile Specific:brush
Profile Specific:param
Attributes
Profile Specific:stripRepeat
Profile Specific:readIndex
Profile Specific:shape
erase
name
value
valuetype
type
color

Usage of the Media Object Level 1 Module requires inclusion of the Media Object Level 0 Module. Consequently, the same usage rules apply.

@@ To be moved to corresponding module
When this module is used it adds the stripRepeat and the readIndex attributes to the ref, animation, audio, img, video, text, and textstream elements of the Media Object Level 0 Module (if present in the language profile).

@@ To be moved to corresponding module
When this module is used, it adds the param element to the content model of the ref, animation, audio, img, video, text, and textstream elements of the Media Object Level 0 Module (if present in the language profile).

@@ To be moved to corresponding module
When this module is used, it adds the rtpmap element to the content model of the ref, animation, audio, img, video, text, and textstream elements of the Media Object Level 0 Module (if present in the language profile).

@@ To be moved to corresponding module
When this module is used it adds the port, the transport, and the rtpformat attributes to the ref, animation, audio, img, video, text, and textstream elements of the Media Object Level 0 Module (if present in the language profile).

@@ To be moved to corresponding module
When this module is used, it adds the brush element to the content model of ?? (@@ needs completion).

2.8 Streaming Media functionality

This section is Informative.

2.8.1 Streaming Media Level 0 Module

Elements
Profile Specific:rtpmap
Attributes
Profile Specific:payload
Profile Specific:encoding
Profile Specific:port
Profile Specific:transport
Profile Specific:rtpformat

2.9 Content Control functionality

This section is Informative.

The Content Control Modules provide a framework for selecting content based on a set of test attributes. The Content Control Modules define semantics for the switch, prefetch and uGroup elements.

2.9.1 Content Control Level 0 Module

Elements
switch
Attributes
skipContent (skip-content)
systemBitrate (system-bitrate)
systemCaptions (system-captions)
systemLanguage (system-language)
systemOverdubOrSubtitle (system-overdub-or-caption)
systemRequired (system-required)
systemScreenSize (system-screen-size)
systemScreenDepth (system-screen-depth)
systemAudioDesc
systemOperatingSystem
systemCPU
systemComponent

@@ To be moved to corresponding module
When this module is used, it adds the switch element to the content model of the par, seq, and excl elements of the Timing Modules (if those are present in the language profile). It also adds this element to the content model of the body element of the Structure Level 0 Module (if present in the language profile). It also adds this element to the content model of the a element of the Linking Modules (if present in the language profile). It also adds this element to the content model of the head element of the Structure Level 0 Module (if present in the language profile).

@@ To be moved to corresponding module
When this module is used, the test attributes are added to the attribute lists of all the elements in the Layout Modules, the Media Object Modules, the Timing Modules, and the Transition Effects Modules (if those are present in the language profile).

@@ To be moved to corresponding module
When this module is used, it adds the skipContent attribute to all other elements in the language profile.

2.9.2 Content Control Level 1 Module

Elements
Profile Specific: prefetch
Profile Specific: uGroup
Profile Specific: userAttributes
Attributes
Profile Specific: uState
Profile Specific: uGroup

Usage of the Content Control Level 1 Module requires inclusion of the Content Control Level 0 Module. Consequently, the same usage rules apply.

@@ To be moved to corresponding module
When this module is used, it adds the prefetch element to the content model of the par, seq, and excl elements of the the Timing Modules (if those are present in the language profile). It also adds this element to the content model of the body element of the Structure Level 0 Module (if present in the language profile). It also adds this element to the content model of the a element of the Linking Modules (if those are present in the language profile).

@@ To be moved to corresponding module
When this module is used, the userAttributes element is added to the content model of the head element (where the uGroup is part of the content model of the userAttributes element). The uGroup attribute is added to the attribute lists of all the elements in the Media Object Modules, and the Timing Modules (if those are present in the language profile).

2.10 Metainformation functionality

This section is Informative.

2.10.1 Metainformation Level 0 Module

The Metainformation Module provides a framework for describing a document, either to inform the human user or to assist in automation. The Metainformation Module defines semantics for the meta and the metadata elements.

Elements
meta
metadata
Attributes
content@@ shouldn't we use a more specific naming for this attribute?
name

@@ To be moved to corresponding module
When this module is used, it adds the meta and the metadata elements to the content model of the head element of the Structure Level 0 Module (if present in the language profile).

2.11 Structure functionality

This section is Informative.

2.11.1 Structure Level 0 Module

The Structure Module provides a framework for structuring a SMIL document. The Structure Module defines semantics for the smil, head, and body elements.

Elements
smil
body
head
Attributes
id
class
xml:lang
title
xmlns
profile

The Structure Level 0 Module is a mandatory module in any language profile in the SMIL language profile family.

2.12 Layout functionality

This section is Informative.

The Layout Modules provide a framework for spatial layout of visual components. The Layout Modules define semantics for the layout, root-layout, and region elements.

2.12.1 Layout Level 0 Module

Elements
layout
region
root-layout
Attributes
type
backgroundColor
background-color (deprecated)
fit
left
right
top
bottom
height
width
z-index

@@ To be moved to corresponding module
When this module is used, it adds the layout element to the content model of the head element of the Structure Level 0 Module (if present in the language profile). It also adds this element to the content model of the switch element of the Content Control Modules (if present in the language profile).

2.12.2 Layout Level 1 Module

Elements
viewport
Attributes
soundLevel

Usage of the Layout Level 1 Module requires inclusion of the Layout Level 0 Module. Consequently, the same usage rules apply.

@@ To be moved to corresponding module
When this module is used, it adds the viewport element to the content model of the layout element.

@@ To be moved to corresponding module
When this module is used, it adds the soundLevel attribute to the region element.

2.12.3 Layout Level 2 Module

Elements
regPoint
Attributes
regPoint
regAlign

Usage of the Layout Level 2 Module requires inclusion of the Layout Level 0 Module and the Layout Level 1 Module. Consequently, the same usage rules apply.

2.13 Linking functionality

This section is Informative.

The Linking Modules provide a framework for relating documents to content, documents and document fragments. The Linking Modules define semantics for the a and the area elements.

2.13.1 Linking Level 0 Module

Elements
<!-- NONE -->
Attributes
sourceLevel
destinationLevel
sourcePlaystate
destinationPlaystate
show
accesskey
tabindex
target
external
actuate

2.13.2 Linking Level 1 Module

Elements
a
anchor
area (as substitute for anchor with shape)
Profile Specific: area supporting fragment attribute
Attributes
href
nohref
shape
coords

@@ To be moved to corresponding module
When this module is used, it adds the a and the anchor (deprected)elements to the content model of the par, seq, and excl elements of the Timing Modules (if those are present in the language profile). It also adds these elements to the content model of the body element of the Structure Level 0 Module (if present in the language profile).

Usage of the Linking Level 1 Module requires inclusion of the Linking Level 0 Module, except for the replacement defined below. Consequently, the same usage rules apply.

@@ To be moved to corresponding module
When this module is used, it adds the fragment attribute to the existing attribute range of the area element.

2.14 SMIL DOM

This section is Informative.

SMIL is an XML language and conforms to the (XML) DOM Core [DOM1], [DOM2]. The SMIL DOM specifies extensions to the DOM Core, adding support for timing and synchronization, media integration, and other synchronized multimedia functionality [SMIL-DOM].

A language profile may include DOM support. The granularity of DOM being supported, corresponds to the modules being selected in that language profile. As with all modules, required support for the DOM is an option of the language profile.

2.15 Isomorphism

This section is Informative.

A requirement for SMIL modularization is that the modules be isomorphic with other modules from other W3C recommendations. Isomorphism will assist designers when sharing modules across language profiles. The Table below lists the isomorphism between SMIL and XHTML modules.

@@ Update with final XHTML Mod REC
Table -- Isomorphism between SMIL modules and their corresponding XHTML modules.
SMIL modules XHTML modules
Functionality Module Name Elements Module Name Elements
Timing Timing Level 0 par, seq <none> -
Timing Level 1 excl, priorityClass <none> -
Animation Animation Level 0 animate, set, animateMotion, animationColor <none> -
Animation Level 1 - <none> -
Transition Effects Transition Effects Level 0 transition <none> -
Transition Effects Level 1 - <none> -
Media Media Object Level 0 ref, audio, video, text, img, animation, textstream Object object
Image img
Applet applet, param
Media Object Level 1 param Object param
rtpmap, brush <none> -
Content Control Content Control Level 0 switch <none> -
Content Control Level 1 prefetch, userAttributes, uGroup <none> -
Structure Structure Level 0 smil, head, body Structure html, head, body, title, span, div
Metainformation Metainformation Level 0 meta, metadata Metainformation meta
Link link
Base base
Layout Layout Level 0 layout, root-layout, region Stylesheet style (CSS)
Layout Level 1 viewport <none> -
Layout Level 2 advanced layout syntax (TBD) <none> -
Linking Linking Level 0 - Hypertext @@ ??
Linking Level 1 a Hypertext a
anchor - -
area Client-side Image Map map, area
DOM SMIL DOM - <none> -

As can be seen in the table, the Metainformation module appears in both SMIL and HTML. In SMIL the Linking Level 1 Module provides towards isomorphism between the corresponding Linking modules in SMIL and XHTML.

2.16 Multimedia Language Profiles

This section is Informative.

There are a range of possible language profiles that may be built using SMIL modules. Below, five language profiles are presented to inform the reader of how language profiles may be constructed to solve particular problems. These example language profiles are non-normative. However, the first three language profiles have been documented as normative specifications by the SYMM WG.

  1. SMIL-Boston Language Profile
  2. HTML+SMIL Language Profile
  3. SMIL-Basic Language Profile
  4. Lightweight Timed-Text Language Profile
  5. Web-Enhanced Media Language Profile

2.16.1 SMIL-Boston Language Profile

The SMIL-Boston Language Profile supports for composition of multimedia presentations. It uses modules from the SMIL module family only. As the language profile includes the three mandatory modules (Structure Level 0, Timing Level 0, and Media Object Level 0), it represents a language profile in the SMIL language profile family.

The SMIL-Boston Language Profile includes the following SMIL modules:

@@ to be checked (in particular by implementers)

A normative specification of the language profile is given in the SMIL Boston Language Profile specification.

2.16.2 HTML+SMIL Language Profile

The HTML+SMIL Language Profile integrates SMIL timing into HTML. It uses modules from the SMIL module family.

The HTML+SMIL Language Profile includes the following SMIL modules:

@@ to be checked (in particular by implementers)

The language profile uses XHTML modules for structure, layout, and linking and SMIL modules for multimedia and timing.

A normative specification of the language profile is given in the HTML+SMIL Language Profile specification.

2.16.3 SMIL-Basic Language Profile

The SMIL-Basic Language Profile supports a lightweight version of the SMIL-Boston language profile and is intended for use with resource-constrained devices such as mobile phones. It uses a subset of the modules used in the SMIL-Boston language profile, which are modules from the SMIL module family. As the language profile includes the three mandatory modules (Structure Level 0, Timing Level 0, and Media Object Level 0), it represents a language profile in the SMIL language profile family.

The SMIL-Basic Language Profile includes the following SMIL modules:

@@ to be checked (in particular by implementers)

2.16.4 Lightweight Timed-Text Language Profile

The Lightweight Timed-Text Language Profile handles simple presentations supporting timing of text content. It integrates SMIL timing with XHTML text markup. The simplest version of this could be used to sequence stock quotes or headlines on constrained devices such as a palmtop device or a smart phone. The language profile uses modules from the SMIL module family. Its complete module set forms a subset of the modules used in the HTML+SMIL language profile.

The Lightweight Timed-Text Language Profile includes the following SMIL modules:

This language profile uses XHTML modules [XMOD] for structure and layout and SMIL modules for timing and animation.

2.16.5 Web-Enhanced Media Language Profile

The Web-Enhanced Media Language Profile supports the integration of interactive broadcast or on-demand streaming media presentations with Web access browsing. The primary media will often define the main timeline. The language profile uses a subset of the modules used in the SMIL-Boston language profile and forms a superset of the modules used in the SMIL-Basic language profile, which are modules from the SMIL module family. However, it may incorporate modules from other namespaces. As the language profile includes the three mandatory modules (Structure Level 0, Timing Level 0, and Media Object Level 0), it represents a language profile in the SMIL language profile family.

The Web-Enhanced Media Language Profile includes the following SMIL modules:

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