So, when I was asked to make a user guide in MS-Word for a web-application, I did the needful, but also went a step-ahead to offer an online help, which could be integrated into the application. Customers are happy when you offer them a little more than what they accept; and needless to say my customer was glad. The only glitch being nobody wanted to offer me a licensed tool.
The XML processing model is widely supported by a number of vendors. The class-based extension mechanism in DITA translates well to the design features of the XSLT and CSS style sheet languages defined by the World Wide Web Consortium and supported in many transformation tools, editors, and browsers.
The toolkit continues to be the foundation of most publishing of DITA content. Many DITA users use it directly, and some DITA authoring tools and content management tools now integrate parts of the toolkit into their own publishing workflows.