Map components Map components include the core components of LwDITA maps, such as key definition, key text, and topic reference. Key definitionA key definition provides a simple way to define a key without making the definition itself a part of rendered content.Key textKey text is variable or link text that is used when resolving key references. It also specifies alternate text for images that are referenced by keys.MapA DITA map is the mechanism for aggregating topic references and defining a context for those references. It contains references to topics, maps, and other resources.Navigation titleA navigation title is an alternative title for a resource. It is designed for situations where the topic title is unsuitable for use in a table of contents or navigation pane.Topic metadataTopic metadata is metadata that applies to a topic based on its context in a map.Topic referenceA topic reference is the mechanism for referencing a topic (or another resource) from a DITA map. It can nest, which enables the expression of navigation and table-of-content hierarchies, as well as containment hierarchies and parent-child relationships.Parent topic: Component reference