2.1.2.3 DITA metadata

Metadata can be applied in both DITA topics and DITA maps. Metadata that is assigned in DITA topics can be supplemented or overridden by metadata that is assigned in a DITA map; this design facilitates the reuse of DITA topics in different DITA maps and use-specific contexts.

2.1.2.3.1 Metadata elements
The metadata elements, many of which map to Dublin core metadata, are available in topics and DITA maps. This design enables authors and information architects to use identical metadata markup in both topics and maps.
2.1.2.3.2 Metadata attributes
Certain attributes are common across most DITA elements. These attributes support content referencing, conditional processing, application of metadata, and globalization and localization.
2.1.2.3.3 Metadata in maps and topics
Topic metadata can be specified in a DITA map as well as in the topics that the map references. By default, metadata in the map supplements or overrides metadata that is specified at the topic level, unless the @lockmeta attribute of the <topicref> element is set to "no".
2.1.2.3.4 Cascading of attributes and metadata in a DITA map
Certain map-level attributes and metadata elements cascade throughout a map, which facilitates attribute and metadata management. When attributes or metadata elements cascade, they apply to the elements that are children of the element where the attributes or metadata were specified. Cascading applies to a containment hierarchy, as opposed to a element-type hierarchy.
2.1.2.3.5 Map-to-map cascading behaviors
When a DITA map (or branch of a DITA map) is referenced by another DITA map, by default, certain rules apply. These rules pertain to the cascading behaviors of attributes, metadata elements, and roles assigned to content (such as the role of "Chapter" assigned by a <chapter> element). Attributes and elements that cascade within a map generally follow the same rules when cascading from one map to another map; this topic covers the exceptions and additional rules that apply.
2.1.2.3.6 Reconciling topic and map metadata
The <topicmeta> element in maps contains numerous elements that can be used to declare metadata. These metadata elements have an effect on the parent <topicref> element, any child <topicref> elements, and – if a direct child of the <map> element – on the map as a whole.

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