DITA specification support DITA Open Toolkit 3.5 supports all versions of the OASIS DITA specification, including 1.0, 1.1, 1.2, and 1.3. DITA 1.2 supportDITA Open Toolkit 3.5 supports the DITA 1.2 specification. While 1.2 is no longer the latest version of DITA, the grammar files (DTD and XML Schema) are still included with DITA-OT and content explicitly created for 1.2 continues to work as intended.DITA 1.3 supportDITA Open Toolkit 3.5 provides processing support for the OASIS DITA 1.3 specification. Initial preview support for this specification was added in version 2.0 of the toolkit; version 2.2 extended this foundation to support key scopes and branch filtering along with additional DITA 1.3 features.DITA 2.0 preview supportDITA Open Toolkit 3.5 provides an initial preview of features for the upcoming OASIS DITA 2.0 specification. This preliminary processing support is provided on the basis of the latest DRAFT versions of the DITA 2.0 DTD and RELAX NG grammar files from OASIS (as of March 2020).Implementation-dependent featuresFor certain features, the DITA specification allows conforming processors to choose between different implementation alternatives. In these cases, there may be differences in behavior when DITA content is handled by different processors. DITA-OT supports implementation-specific features by applying one or more of the permissible processing approaches.Extended codeblock processingDITA-OT provides additional processing support beyond that which is mandated by the DITA specification. These extensions can be used to define character encodings or line ranges for code references, normalize indendation, add line numbers or display whitespace characters in code blocks.DITA features in the documentationDITA Open Toolkit uses various recent DITA features in the project documentation.