For instance, the -f switch commonly used to tell a program to read a configuration file complicates the configuration because the file may override or supplement options given on the command line.

The code supplement in the Resources section has an example TeX file that showcases the above commands.

Thus, in these situations, it is necessary to supplement XJConf with the DOM extension in PHP, which provides an API to dynamically construct an XML tree and write it to a file.