Configure the custom map shell DTD for DITA 1.3 (DRM)
Important: Follow these instructions only if you are using the Dynamic Release Module (DRM). If you are not using DRM, use the previous topic, Configure the custom map shell DTD for DITA 1.3.
Even if you do not need a custom map shell at this point, it is very likely that you will. For example, if you specialize any conditional/profiling attributes, you will probably want to be able to use them on topicref elements within maps as well as on elements within topics. To make sure you have the environment you need from the start, create a custom map shell.