From Eliot Kimber's XML 2007 Lightning Round Presentation: "DITA's specialization mechanism both enables sophisticated generic processing and effectively demands that tools provide it. That is, when presented with valid, conforming DITA documents, tools should "just work," applying all appropriate default DITA processing and behavior without any up-front configuration (with the possible exception of specifying the entity resolution catalog needed to resolve references to DTDs and schemas). Not many tools beyond the DITA Open Toolkit actually do just work. RSuite does.