- [absolute dimension]
A scalar value that denotes a length on either the
horizontal axis or the
vertical axis.
- [abstract document instance]
An instance of an abstract data set as represented by a
reduced xml infoset.
- [abstract document type]
A set of constraints that defines a class of XML Information
Sets [XML InfoSet].
- [anonymous profile]
See undesignated profile.
- [anonymous span]
A span element that is not present in a
document instance, but is synthesized and inserted into the corresponding
abstract document instance by the
[construct anonymous spans] procedure
during the 11.3.1.3 Intermediate Synchronic Document Construction or 11.3.1.4 Synchronic Flow Processing steps.
- [area]
A collection of addressable logical pixels that represent the visual content of a bounded, rectangular region of a plane
on some output medium, as defined by [XSL-FO 1.1], Rectangular Areas, §4.2.
Also referred to as a box, particularly in the context of [CSS2] and [HTML 5.2].
- [attribute information item]
Each specified or defaulted attribute of an XML document corresponds with an attribute information
item as defined by [XML InfoSet], §2.3.
- [audio defining context]
The context in which an audio element is specified to serve as
a sharable definition to be referenced by another audio element
in an audio presentation context.
- [audio generating element]
An audio element in an
audio presentation context or a
span element whose character content is
used to generate a speech data resource.
- [audio presentation context]
The context in which an audio element is specified for the
purpose of being presented (rendered). Such an audio element
may specify the audio data inline by using a data element within
a source element child, or it may reference another
audio element specified in a
audio defining context, or it may do both.
- [audio resource]
A data resource that contains coded or unencoded audio samples.
- [audio stream]
A sequence of audio samples.
- [background painting rectangle]
A rectangle in the document coordinate space
with respect to which a background presentation artifact, e.g., color or image, is (possibly) clipped and painted; more
specifically, one of three rectangles: the border rectangle, the padding rectangle, or the content rectangle
of an area generated by an element associated with a background. The computed value of the style property specified by the
tts:backgroundClip attribute determines which rectangle applies.
- [background positioning rectangle]
A rectangle in the document coordinate space
with respect to which a background presentation artifact, e.g., color or image, is positioned or sized; more
specifically, one of three rectangles: the border rectangle, the padding rectangle, or the content rectangle
of an area generated by an element associated with a background. The computed value of the style property specified by the
tts:backgroundOrigin attribute determines which rectangle applies.
- [baseline profile]
A profile referenced by the use attribute of a ttp:profile element,
which serves as a baseline (initial) set of specifications with which to populate the referencing profile.
- [block area]
A fundamental type of area defined by [XSL-FO 1.1], Block-areas, §4.4, which children
consist of either all block areas (if the block area is not a line area)
or all inline areas (if the block area is a line area).
- [block display]
Block display is a set of layout semantics that may be applied to a content element in
certain contexts, wherein child areas are composed sequentially in the block progression direction.
Note:
In [CSS2],
block display is indicated when a CSS display property with the value block is applied to a
content element during presentation processing. In [XSL-FO 1.1], a block display
occurs when composing a fo:block element.
- [block progression dimension]
A relative dimension on the block progression axis,
i.e., in the positive block progression direction,
abbreviated as bpd or BPD.
- [block progression direction]
The direction taken by the progression of block areas in some formatting context. In the context of horizontal writing modes,
the block progression direction is typically top-to-bottom; whereas, in the context of vertical writing modes,
it is typically right-to-left or left-to-right.
- [built-in data resource]
A data resource the content of which is supplied by the
content processor and not the
timed text content document instance, referenced by means
of a source element or a src
attribute of a source element or embedded
content element.
- [character information item]
Each data character appearing in an XML document corresponds with a character information
item as defined by [XML InfoSet], §2.6.
- [chunked data embedding]
A data element that directly embeds a representation of the actual bytes
of an embedded data resource by making use of a
child chunk element.
- [combined profile]
A profile for which the constituents component of the combined specification set component of the
associated profile instance contains more than one non-null designator.
- [computed cell size]
The size (extent) of a cell computed by dividing the width of the root container region
by the cell column count, i.e., the number of cells in the horizontal axis, and by dividing
the height of the root container region by the cell row count, i.e., the number of cells in the vertical
axis, where the cell column and row counts are determined by the ttp:cellResolution parameter attribute.
- [computed style set]
A style set containing computed style values as determined
by 10.4.4.3 Computed Style Set Processing.
- [conditionalized element]
Any element of a type defined in or for use by this specification that permits the specification of a
condition attribute the evaluation of which
determines whether the defined semantics of the element apply or are ignored. In the absence of such
attribute, the semantics of the element always apply.
- [conditionally excluded (or included)]
If the condition expression of a conditionalized element evaluates
to false, then the element and its descendant elements are said to be conditionally excluded.
If an element is not conditionally excluded, then it is said to be conditionally included.
Note:
An element that is conditionally included but does not permit the use of or does not specify a
condition attribute may be referred to as
an unconditionally included element.
When an element is conditionally excluded, then, unless specified otherwise, all of its semantics are ignored, about
which see condition for the detailed semantics of conditional exclusion.
Note:
In the case of certain elements, for example the style element,
conditional exclusion causes some but not all of the element's semantics to be ignored,
in which case such behavior is described explicitly.
- [content element]
Any of the element types defined by the Content Module, as well as
any of the element types defined by the Audio Module
and the Image Module when they occur in an
audio presentation context or
image presentation context, respectively.
- [content image]
An image resource that contains semantically significant content, e.g., a raster image
representing the rendering of a caption.
- [content processor]
A processing system capable of importing (receiving) Timed Text Markup Language
content for the purpose of transforming, presenting, or otherwise processing the content.
- [content profile]
A profile such that (1) the value of the type component of the associated
profile instance is content and
(2) the collection of features and extensions of which
must not, must, or may be employed by Timed Text Markup Language content.
- [content region]
A logical, rectangular region into which content is rendered when performing presentation processing.
Abbreviated simply as region when the context is unambiguous, each content region is
defined by an explicitly specified or an implied region element
which defines the extent of the content region in relation to a root container region
as well as other stylistic and temporal characteristics.
- [data binding context]
The context in which a data element is specified for the
purpose of semantic binding (association). Such a data element
may specify the data inline by using a data element within
a source element child, or it may reference another
data element specified in a
data defining context, or it may do both. No presentation (rendering)
semantics are implied by the mere presence of a data element in this (or any) context.
- [data binding context for metadata]
A data element the parent of which is a
metadata element.
- [data binding context for source]
A data element the parent of which is a
source element.
- [data defining context]
The context in which a data element is specified to serve as
a sharable definition to be referenced by another data element
in a data binding context, namely, a
data element the parent of which is a
resources element.
- [data element]
Any of the element types defined by the Data Module.
- [data resource]
An arbitrary data resource represented or referenced using a data element. For example,
a data resource may be used to embed or refer to an audio clip, a font, an image, or arbitrary application data in a
timed text content document instance.
- [default processor profile]
A default processor profile used to compute an
effective processor profile in the absence of a declared or inferred
processor profile, where this default processor profile is determined by
the construct default processor profile
procedure.
- [default region]
A default out-of-line region that is implied in the absence of
an explicitly specified out-of-line region element, i.e.,
when no region element is specified as a child of
a layout element.
- [designated profile]
A profile that is associated with a by
means of a designator attribute or prose text in a specification of profile.
- [display aspect ratio]
See definition of DAR.
- [document coordinate space]
A logical coordinate space which determines the aspect ratio and resolution of the
root container region used to format and present a
document instance, more about which see
H Root Container Region Semantics.
- [document instance]
A timed text document instance.
- [document interchange context]
The implied context or environment external to a content processor in
which document interchange occurs, and in which out-of-band protocols or specifications
may define certain behavioral defaults, such as an implied profile.
- [document processing context]
The implied context or environment internal to a content processor in
which document processing occurs, and in which out-of-band protocols or specifications
may define certain behavioral defaults, such as the establishment or creation of a
synthetic document syncbase.
- [document temporal coordinate space]
The temporal coordinate system relative to which computed time expressions are interpreted in a
document instance, more about which see
7.2.11 ttp:timeBase.
- [effective content profile]
The content profile computed from the set of all content profiles
explicitly or implicitly referenced by or assigned to a TTML document instance after applying any
explicit or implicit profile and profile specification combination methods, about which see the
construct effective content profile procedure.
When performing validation on a given document instance,
then this validation is performed by making use of a document's effective content profile.
- [effective processor profile]
The processor profile computed from the set of all processor profiles
explicitly or implicitly referenced by or assigned to a TTML document instance after applying any
explicit or implicit profile and profile specification combination methods, about which see the
construct effective processor profile procedure.
When determining if a content processor
can or cannot process a given document instance, then this determination is performed
by making use of a document's effective processor profile.
- [effective validation profile]
A profile used to select a schema (or set of schemas) to be used during validation processing,
as determined by the construct effective
validation profile procedure.
- [effective validation schemas]
A set of schemas used during validation processing,
as determined by the construct effective
validation schemas procedure.
Note:
Since no schema language captures all constraints on TTML content as defined by this specification, it is expected that additional
built-in, programmatic (code-based) schemas will be employed by a validating content processor.
- [element information item]
Each element appearing in an XML document corresponds with an element information
item as defined by [XML InfoSet], §2.2.
- [embedded content element]
Any of the element types defined by the Audio Module,
Data Module,
Font Module, or
Image Module.
- [embedded content resource]
An audio resource, data resource, font resource,
or image resource.
- [embedded data resource]
A data resource embedded in a
timed text content document instance, represented by means of
a data element, whether or not that
data element represents the actual bytes of the
data resource or refers to an external data resource.
- [empty data resource]
A data resource that contains no renderable content, and further,
if an attempt is made to resolve this resource to a series of content samples, no samples are produced.
- [enclosing document instance]
The document instance that encloses or otherwise contains
an enclosed feature or component.
- [exchange profile]
A profile of content that serves a set of needs for content interchange.
- [extension]
A syntactic or semantic expression or capability that is defined and
labeled (using a extension designation) in another (public or private)
specification.
- [extension specification]
A specification of a constraint or requirement that relates to an
extension, typically expressed by
an ttp:extension element.
- [external data resource]
A data resource external to a
timed text content document instance, referenced by means
of a source element or a src
attribute of a source element or embedded
content element.
- [external source]
Either (1) a source element or a src attribute
that refers to an external data resource or (2) the referenced
external data resource.
- [feature]
A syntactic or semantic expression or capability that is defined and
labeled (using a feature designation) in this specification (or a past or
future revision of this specification).
- [feature specification]
A specification of a constraint or requirement that relates to an
feature, typically expressed by
an ttp:feature element.
- [forced subtitle]
A subtitle (or caption) that is intended to always be displayed even if subtitles (captions) are not enabled. Forced subtitles (captions)
are used to prevent open captioning of, i.e., burning in, subtitles (captions) related to foreign or alien language or translation of text
that appears in media, such as in a sign.
- [font defining context]
The context in which a font element is specified to serve as
a sharable definition to be referenced indirectly by a font selection process.
- [font selection process]
An internal process used by a presentation processor which purpose is to select
a set of author defined fonts and platform fonts for use during layout and presentation processing, where input parameters to this
process include the computed values of font related properties, the capabilities of individual fonts, and the text content being presented.
- [font resource]
A data resource that contains font information, such as character to glyph mapping data, glyph outlines or images,
glyph metrics, and other data used in the character to glyph mapping and rendering process.
- [height]
An absolute dimension on the vertical axis.
- [fragment identifier]
A syntactic subset of a value that adheres to the
fragment identifer syntax defined by [URI], §3.5.
- [glyph area]
A type of inline area defined by [XSL-FO 1.1], Glyph-areas, §4.6.2.
In this specification, a glyph area is associated with one or more content characters and one or more glyphs from a particular font, where it is these
glyphs that are rendered when presenting the glyph area. A spacing glyph area is a glyph area that is associated with
at least one spacing glyph, i.e., a glyph that has non-zero advance (width or height). A non-spacing glyph area is
a glyph area that is not a spacing glyph area, i.e., consists wholly of non-spacing glyphs.
- [glyph area descendant]
A glyph area that is a descendant area of some other area implied by the context of use.
For example, a descendant area of an inline area I that is a glyph area is a
glyph area descendant of I.
- [image defining context]
The context in which an image element is specified to serve as
a sharable definition to be referenced by another image element
in an image presentation context.
- [image presentation context]
The context in which an image element is specified for the
purpose of being presented (rendered). Such an image element
may specify the image data inline by using a data element within
a source element child, or it may reference another
image element specified in a
image defining context, or it may do both.
- [image resource]
A data resource that contains a raster image.
- [inferred processor profile]
A processor profile determined by the
construct inferred processor profile procedure which may
serve as the effective processor profile used to perform
validation processing.
- [inline animation]
An animate or set element
that is defined inline as an immediate child of
a content element or region element associated with the animation.
There is a one-to-one relation between
an inline animation element and its parent content element or region element.
- [inline area]
A type of area defined by [XSL-FO 1.1], Inline-areas, §4.6, which children
consist of all inline areas, for example, glyph areas.
- [inline block display]
Inline block display is a set of layout semantics that may be applied to a content element in
certain contexts, wherein a generated block area is treated as an atomic area to be composed in an inline layout context, i.e., the block
area is treated as if it were itself an inline area when considered externally, but as a block area which considered internally.
- [inline display]
Inline display is a set of layout semantics that may be applied to a content element in
certain contexts, wherein child areas are composed sequentially in the inline progression direction.
Note:
In [CSS2],
inline display is indicated when a CSS display property with the value inline is applied to a
content element during presentation processing. In [XSL-FO 1.1], an inline display
occurs when composing a fo:inline element.
- [inline progression dimension]
A relative dimension on the inline progression axis,
i.e., in the positive inline progression direction,
abbreviated as ipd or IPD.
- [inline progression direction]
The direction taken by the progression of inline areas in some formatting context. In the context of horizontal writing modes,
the inline progression direction is typically left-to-right or right-to-left; whereas, in the context of vertical writing modes,
it is typically top-to-bottom.
- [inline region]
A region that is defined in an inline manner with respect to some
content element to be selected into (targeted to) the region.
An inline region is specified either explicitly by a region element child of
certain content elements.
There is a one-to-one relation between an inline region element and its
parent content element. An inline region is assigned its parent element's time interval as its active
time interval. No region attribute makes reference to an inline region.
- [intermediate synchronic document]
A timed text intermediate document or a
timed text intermediate document instance, according to the context of use,
where the root (document) element is an isd:isd element, and which represents a
non-overlapping temporal interval that intersects with the content, styling, layout, and timing of a source
timed text content document.
- [intermediate synchronic document sequence]
A timed text intermediate document or a
timed text intermediate document instance, according to the context of use,
where the root (document) element is an isd:sequence element, and which represents a
sequence of intermediate synchronic document instances
that effectively represent the content, styling, layout, and timing of a source timed text content document.
- [intermediate document syntax]
A formalism for use in the concrete representation of an intermediate synchronic document sequence or
an intermediate synchronic document.
- [intrinsic block content extent]
The extent, i.e., width and height, of a sequence of block level content determined by formatting the content to an unbounded block
container area, and determining the width and height of the resulting, formatted block container.
- [intrinsic image extent]
The extent, i.e., width and height of an image determined from information internal to the image itself, e.g.,
the width and height of the image's pixel array.
- [intrinsic inline content extent]
The extent, i.e., width and height, of a sequence of inline level content determined by formatting the content to an unbounded inline
container area, and determining the width and height of the resulting, formatted inline container.
- [higher level protocol]
A protocol or process of the document processing context
that is outside the scope of this specification.
- [horizontal axis]
An axis parallel to the plane of the horizon.
- [line area]
A type of block area defined by [XSL-FO 1.1], Line-areas, §4.5, which children
consist of one or more inline areas.
- [metadata element]
Any of the element types defined by the Metadata Module.
- [nested profile]
A constituent profile of a nesting profile, i.e., one of the
descendant ttp:profile element(s) of a higher level (ancestor) ttp:profile element. A given ttp:profile may serve
as both a nested profile and a nesting profile.
- [nesting profile]
A profile defined by making reference to one or more child ttp:profile element(s), wherein a
profile combination method determines how profile specifications from the multiple child ttp:profile element(s) are combined.
The constituents component of the profile instance associated with a
nesting profile is not null.
- [nested embedded source]
A source element that specifies a child
data element which embeds the actual bytes of the
embedded data resource, whether by
simple data embedding or chunked data embedding.
- [non-combined profile]
A profile for which the constituents component of the combined specification set component of the
associated profile instance contains no more than one non-null designator.
- [non-content image]
An image resource that does not contain semantically significant content, e.g., a raster image
representing a background design, which, if not presented, would not affect the presentation of semntically significant content.
- [non-nested embedded source]
A source element that specifies a child
data element which does not embed a representation of the actual bytes of the
embedded data resource.
- [non-nesting profile]
A profile defined without making reference to one or more child ttp:profile element(s), that is,
by not including a child ttp:profile element.
The constituents component of the profile instance associated with a
non-nesting profile is null.
- [out-of-line animation]
An animate or set element that is defined out-of-line from
the content element or region element associated with the animation.
An out-of-line animation appears as a child of an animation element in the header
(head element)
of a document instance, and specifies an xml:id attribute
which value is referenced by an animate attribute
on the associated element to be animated. There is a one-to-many relation between
a referenced out-of-line animation element and referencing content elements and
region elements.
- [out-of-line region]
A region element that is defined out-of-line from
a content element associated with (to be selected into) the region.
An out-of-line region appears as a child of a layout element in the header
(head element)
of a document instance, and specifies an xml:id attribute
which value is referenced by a region attribute
on the associated element to be selected into the region. There is a one-to-many relation between
a referenced out-of-line region element and referencing content elements.
A default out-of-line region is implied if no
out-of-line region is specified explicitly.
- [override content profile]
A content profile that is determined to override all other
possible determinations of a content profile.
- [override processor profile]
A processor profile that is determined to override all other
possible determinations of a processor profile.
- [pixel aspect ratio]
See definition of PAR.
- [presentation context]
See presentation processing context.
- [presentation processing context]
A hypothetical display device on which the root container region and a
related media object region are presented.
- [presentation context coordinate space]
The coordinate space associated with the presentation context.
- [presentation related element]
Any element which (1) contains or expresses presentable content or (2) affects the presentation of content. Examples of the
former include all content elements and certain
embedded content elements, notably
audio as well as image.
Examples of the latter include inline animate and
set. Note well that
metadata elements are excluded from this definition.
- [presentation processor]
A content processor which purpose is to layout, format, and render,
i.e., to present, Timed Text Markup Language content by applying the presentation semantics
defined in this specification.
- [processor]
See content processor.
- [processor profile]
A profile such that (1) the value of the type component of the associated
profile instance is processor and
(2) the collection of features and extensions of which
must or may be implemented (supported) by a content processor.
- [profile]
A collection of features and extensions, which, when
interned (instantiated), is represented by a profile instance state object.
A profile is typed as a content profile or a processor profile.
- [profile definition document]
A timed text profile document or a
timed text profile document instance, according to the context of use.
- [profile fragment identifier]
A fragment identifier used to label or reference an internally defined profile, where
internal refers to being internal to a document instance.
- [profile processing]
The process of performing the [abort if
unsupported processor profile] procedure, which, as a side effect, determines the
effective content profile (if required) and
the effective processor profile of a document instance.
- [profile specification]
A feature specification or an extension specification
or the internal state representation thereof.
- [reduced xml infoset]
An XML Information Set [XML InfoSet] that satisfies the
constraints specify by B Reduced XML Infoset.
- [region]
The root container region or a
content region, which, if used without qualification,
refers to the latter.
Note:
While there is only one, unique root container region associated with document presentation,
this specification does not place a restriction on the number of content regions used over time
or at a given time. Some content profiles, however, do
specify such restrictions.
- [related media object]
A (possibly null) media object associated with or otherwise related
to a document instance. For example, an aggregate audio/video media
object for which a document instance provides caption or subtitle
information, and with which that document instance is associated.
- [related media object region]
A region of the presentation processing context where a non-null, visual
related media object is presented.
- [relative dimension]
A scalar value that denotes a length on either the inline or block progression axis in accordance with
the applicable writing mode.
- [root container region]
A unique, logical, rectangular region that establishes a coordinate system into which
content regions are placed and optionally clipped,
about which see also H Root Container Region Semantics.
Note:
The root container region has no border or padding; consequently, its border, padding, and
content rectangles are coterminous.
- [root temporal extent]
The temporal extent (interval) defined by the temporal beginning and ending of a document instance
in relationship with some external application or presentation context.
- [simple data embedding]
A data element that directly embeds a representation of the actual bytes
of an embedded data resource without making use of a
child chunk element.
- [smpte time code]
A time code whose format and semantics are established by [SMPTE ST 12-1],
which may be embedded into or otherwise associated with media content, such
as a broadcast audio/video stream.
- [sourced data embedding]
A data element that indirectly references the content
of an embedded data resource by making use of a
child source element.
- [specified style set]
A style set containing specified style values as determined
by 10.4.4.2 Specified Style Set Processing.
- [speech data resource]
A data resource that consists of the samples generated by the output of the
speech synthesis processor.
- [speech synthesis processor]
An optional component of a content processor,
the function of which is to synthesize an audio speech rendering of textual content.
- [storage aspect ratio]
See definition of SAR.
- [style set]
A style property set as defined
by style property set.
- [styled element]
An element which is or may be associated with a computed style set.
- [synthetic document syncbase]
A document level syncbase
[SMIL 3.0], §5.7.1, synthesized or otherwise established by
the document processing context in accordance with the
related media object or other processing criteria.
- [synthetic smpte document syncbase]
A synthetic document syncbase constructed from smpte time code
values embedded in or associated with the related media object or
otherwise determined by the document processing context.
- [temporally active]
A syntactic or semantic feature, e.g., an element or the presentation of an element, is
temporally active when the current time of the selected time base intersects with the
active time interval of the feature.
- [temporally active region]
A region that is temporally active.
- [text orientation]
A characterization of the orientation of a glyph area in terms of degrees of rotation, where
0° designates an upright orientation and
90°, i.e, 90 degrees clockwise, designates a sideways orientation,
about which see also 10.2.45 tts:textOrientation.
- [timed element]
Any element of a type that permits the specification of a begin attribute.
- [timed text]
Textual information that is intrinsically or extrinsically
associated with timing information.
- [timed text authoring system]
A content authoring system capable of importing and exporting
Timed Text Markup Language content.
- [timed text content document]
An abstract document that is purported or confirmed to be a
valid abstract document instance of
the TTML Content Document Type.
- [timed text content document instance]
A concrete realization of a timed text content document,
about which see also A Concrete Encoding.
- [timed text document instance]
A concrete realization of a
timed text markup language document,
where the concrete form is specific to the context of reference.
Also referred to as a TTML document instance
or simply document instance.
- [timed text intermediate document]
An abstract document that is purported or confirmed to be a
valid abstract document instance of
the TTML Intermediate Document Type.
- [timed text intermediate document instance]
A concrete realization of a timed text intermediate document,
about which see A Concrete Encoding.
- [timed text markup language]
A content type that represents timed text content, intermediate representations of this content, or profiles of this content or content processors.
- [timed text markup language document]
An abstract document that is purported or confirmed to be a
valid abstract document instance.
- [timed text profile document]
An abstract document that is purported or confirmed to be a
valid abstract document instance of
the TTML Profile Document Type.
- [timed text profile document instance]
A concrete realization of a timed text profile document,
about which see A Concrete Encoding.
- [top-level profile]
A profile defined by a ttp:profile element that appears as a child
of the head element.
- [transformation processor]
A content processor which purpose is to transform or otherwise rewrite
Timed Text Markup Language content to either Timed Text Markup Language
or to another (arbitrary) content format. An example of the first is a processor that removes
or rewrites TTML features so as to conform to a profile of TTML. An example of the latter is
a processor that translates TTML into a completely different timed text format. Because this
specification does not otherwise define a target profile or format for transformation processing,
no further transformation semantics are defined by this specification.
- [undesignated profile]
A profile that is not associated with a profile designator,
and which is referred to implicitly in the context of the profile's definition. Also referred to as an anonymous profile.
- [valid abstract document instance]
An abstract document instance which has been assessed for validity
and found to be valid as defined by 4 Document Types.
- [validation processing]
The function(s) performed by a validation processor.
- [validation processor]
An optional component of a content processor, the function of which is to perform validation processing on a
candidate document instance prior to performing certain other type of processing,
and where that validation processing consists of performing the
[validate document] procedure
as defined by 5.3 Validation.
- [validating content processor]
A content processor that implements a validation processor
component as a pre-processing step prior to performing its primary function as a content processor.
Note:
A validating content processor may have (1) the sole function of validating (or verifying) a document instance,
in which case it may be considered a validating transformation processor the
output of which indicates validity (or not), or (2) multiple functions, the first of which is validating (or verifying) a document instance
and then performing its primary function as a transformation processor or
presentation processor.
Note:
When validation processing is performed, a conforming validating content processor is permitted to interleave validation
processing and content processing, provided that the latter does not temporally precede the former for a give unit of content.
- [vertical axis]
An axis perpendicular to the plane of the horizon.
- [width]
An absolute dimension on the horizontal axis.
- [writing mode]
An enumeration collection of tokens, each of which designates a combination of the axis and direction of flow of
both inline and block oriented content, about which see 10.2.51 tts:writingMode.
