Compiled Help (CHM) output
The transform type "htmlhelp" is used to create HTML Help
control files. If the build runs on a system that has the HTML Help
compiler installed, the control files will be compiled into a CHM
file.
Once the preprocess and XHTML process is complete, most
of the HTML Help processing is handled by the dita.map.htmlhelp target.
This target creates several files:
- The HHP file is the control file for the HTML Help project.
- The HHC file contains the HTML Help table of contents.
- The HHK file contains the HTML Help index. This file is sorted based on the language of the map.
The dita.htmlhelp.convertlang is a post-processor
for the content to ensure that it can be processed correctly by the
compiler, and that the appropriate codepages and languages are used.
Finally, compile.HTML.Help attempts
to detect the HTML Help compiler; if found, it compiles the full project
into a single CHM file.