Although the DITA standard itself does not set rules about file and folder naming, the DITA Open Toolkit has strict requirements for file and folder names. Problems with file and folder names may cause publishing to fail.

It is best to set guidelines  about file and folder naming conventions before you start creating references such as <topicref>s in maps, as references include file names and folder paths.

The DITA Open Toolkit does not support file names that contain:

• spaces
• punctuation