Maybe I'm missing some setting .. but as far as I know, it's fine to define keys in the root map or any submap. In a submap, I'm assigning keys thusly .. <topicref href="some-topic-1.xml" keys="p_1"/> <topicref href="some-topic-2.xml" keys="p_2"/> This works fine for an OT build, keys resolve fine, but Oxygen complains that these keys are not defined. It seems to only work if I declare a keydef in the root map that points to this file. <keydef keys="p_1" href="groups/group1/some-topic-1.xml"/> <keydef keys="p_2" href="groups/group1/some-topic-2.xml"/> I really don't want to define the filename of these topics in the root map .. it's much more convenient to keep them in the submaps with the topicrefs. Is this an issue in Oxygen or something that I'm missing? Thanks! Scott