B.1.1 Changes from DITA 1.1 to DITA 1.2
(Non-normative) DITA 1.2 adds a number of new features to DITA, including indirect
addressing via map-defined keys; the ability to define content-model constraints for DITA
document types; specializations for learning content and the machine industry; and taxonomies,
ontologies, and controlled vocabularies. Other refinements include extended markup for
glossaries and terminology.
The following features are new in DITA 1.2:
- Keys and key references. See Key-based (indirect) addressing.
- Constraint modules. Constraint modules allow base content models to be further
constrained without the need for specialization. For example, a constraint module can
make optional elements required or disallow optional elements in a specific content
model. See Constraint domains.
- Topic and map specializations for learning and training information, including
interactive assessments. See The DITA
learning and training content specialization.
- New elements for use with glossary entry topics for more complete description of
terms, definition of acronyms, and so on.
- New map specialization for defining controlled vocabularies and taxonomies. See subjectScheme.
- New machine-industry task specialization. See Machinery task topic.
New element types
The following base element types are new in DITA 1.2:
- Allowed in most contexts where text is allowed but neither <ph> nor <keyword>
are allowed. Enables reuse of text in almost any context.
- Allows creation of untitled containers within topic bodies. Intended primarily for
- Allows creation of untitled containers within sections. Intended primarily for
- Topicref specialization for defining keys. Sets the default value for the
@processing-role attribute to "resource-only".
- Topicref specialization for referring to DITA maps. Sets the default value for the
@format attribute to "ditamap".
- Used to define sets of topicrefs that represent an atomic unit of reusable
navigation structure. Requires the @id attribute be specified.
- References a <topicset> element. Enables preservation of the identity of the
- Defines a point within a map to which topicrefs can be bound using the
- "Pushes" one or more topicrefs onto an anchor point defined by an <anchor>
element. Similar to a conref push but allows the relationship to be managed
dynamically by the renderer.
Refinements to maps
- Map elements can use the <title> element in place of the title attribute.
- Relationship table elements can have <title> as an optional first child.
- Topicref elements can use the <navtitle> element in place of the navtitle
- Maps and topicrefs can now contain the same metadata elements as topic prologs.
- New topicref attribute named processing-role. Indicates whether or not a topic
reference contributes to the navigation structure of the containing map.
Refinements to content references
- Content references can now point to ranges of elements. For example, a single content
reference from a <step> element can include a sequence of <step> elements.
- Content references can "push" elements into a target context, allowing unilateral
augmentation of topics from other topics. For example, given a base topic with generic
content, a using map could include both the generic topic and a separate topic that uses
conref push to add map-specific content to the generic topic.
- Content reference resolution can be deferred so that it is done later in a rendering
process or completely deferred so that it can be done by a separate delivery mechanism,
for example., Eclipse information centers.
Refinements to topic elements
- The base task topic type has a more relaxed content model. This enables creation of a
wider variety of specialized tasks, including task specializations that do not have
formal markup for individual steps. The OASIS-defined task shell document type
integrates a constraint module that imposes the same constrained content model as
defined in the DITA 1.1 task topic type.
- A number of content elements allow the new @keyref attribute, including the <ph>,
<keyword>, and <term> elements. When using the @keyref attribute, these elements
can get their effective content from the key-defining <topicref> element and can also
be treated as navigation links to the resource pointed to by the key-defining
<topicref> element, if any. For example, a term element can use @keyref to link to
the glossary entry topics for the term.
- The <image> element takes the new @scalefit attribute, which indicates whether or
not the image should be scaled to fit the presentation context.
- The <draft-comment> element is now allowed in most contexts.
- The <figgroup> element now allows <data> as a subelement.
Refinements to specialization
- Structural and domain vocabulary modules can now both be listed in the domains
attribute. Structural modules can depend on and specialize elements from domains. For
example, a structural domain for reference topics for a specific programming language
could depend on the Programming domain (pr-d) and specialize elements from that
- Information Architects can indicate whether the use of a given vocabulary module
requires strict or weak checking of content reference constraints.
- The implementation patterns for vocabulary modules have been refined. In particular,
each element type now defines a separate parameter entity for its content model and
attribute list, allowing per-element configuration of content models and attribute lists
through constraint modules.
- The <dita> element now has the @DITAArchVersion attribute.
- A number of processing details have been clarified where they were underspecified in
- Most attributes that had enumerated values in DITA 1.1 are now unenumerated, allowing
specializations to define different enumerations if they choose.
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DITA v1.2 CD 03
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