DITA: Keyref links
You create a key (a word) in your map and define what the key links to. In your topic, you link to the key. This way, if you need to change the link, you need only change the key's reference in your map file. You don't have to change all the keys in your topics.
You just use
keyref instead of
You can use a keyref anywhere there's an href:
or with images:
If the key isn't defined in the map, it doesn't appear in the output. This makes it better to use for your related links because you won't run into issues of the link being dependent on the file being present.