Reference The Reference topics provide more advanced information about the DITA-OT architecture, OASIS specification support, and licensing. DITA Open Toolkit ArchitectureDITA Open Toolkit is an open-source implementation of the OASIS specification for the Darwin Information Typing Architecture. The toolkit uses Ant, XSLT, and Java to transform DITA content (maps and topics) into different deliverable formats.DITA specification supportDITA Open Toolkit 4.2 supports all versions of the OASIS DITA specification, including 1.0, 1.1, 1.2, and 1.3.Extension point referenceDITA Open Toolkit provides a series of extension points that can be used to integrate changes into the core code. Extension points are defined in the plugin.xml file for each plug-in. When plug-ins are installed, DITA-OT makes each extension visible to the rest of the toolkit.Markdown formats The following topics show how DITA XML constructs are represented in Markdown and MDITA, provide details on common syntax, differences between the markdown and mdita formats, and describe additional configuration options. License Information DITA Open Toolkit is released under the Apache License, Version 2.0. GlossaryCertain terms have particular meaning in the context of the DITA Open Toolkit project.