DITA uses certain naming conventions and file extension for topics, maps, modules, and document-type implementation files.
Files that contain DITA content should use the following naming conventions:
Conditional processing profiles
Files that define DITA document-type components must use the following naming conventions:
Where typename is the name of the intended root topic or map type defined by the document type shell or, as needed, a name that clearly identifies both the intended root map or topic type and distinguishes the document type shell from other shells for the same root type.
Note: For example, the OASIS-provided document-type shells for technical content include two different document-type shells for the task topic type: task.dtd and generalTask.dtd, where task.dtd includes the strict task body constraint module and generalTask.dtd does not.