The related-links section of DITA topics is a special structure that supports the navigational rules from a topic to its related neighbor topics.
Links are different from cross-references in that cross-references occur only within the body of a topic and can target any element in this or other topics; links only represent topic-to-topic connections, or connections to non-DITA-topic resources.
Related links can also be managed indirectly using DITA maps, which provide a more efficient way to manage links as an aspect of the collection of topics rather than as embedded pointers in each topic.
OASIS DITA Language Specification v1.0 -- 09 May 2005
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