Keyref elements
You can use the "keyref" feature in DITA 1.2 as an indirect addressing mechanism. Instead of linking directly to topics or maps, these can be given a symbolic name (key attribute) that points to a topic file path (href attribute). References to the topics are made using a key reference (keyref attribute). If the topic is relocated, the path needs to be updated only in the map where it is defined. All other references will automatically pick up the new location.