The Darwin Information Typing Architecture (DITA) is an XML-based architecture for authoring, producing, and delivering technical information. It divides content into small, self-contained topics that can be reused in different deliverables. The extensibility of DITA permits organizations to define specific information structures and still use standard tools to work with them.
A file is considered to be a dita topic document when either of the following occurs:
root element name is one of the following: concept, task, reference, dita, topic;
public id of the document is one of the public id's for the elements above.
the root element of the file has an attribute named "DITAArchVersion" attribute from the "http://dita.oasis-open.org/architecture/2005/" namespace. This enhanced case of matching is only applied when the Enable DTD processing option from the Document Type Detection option page is enabled.