I want to use a specific code style in my editor defined in an XML file, which looks something like this:
If your XML is previously exported Intellij you can simply do:
File > Import Settings > select your xml
If its custom defined, one you can try copying your xml to intellij config directory:
config/codestyles
Assuming your xml is in format intellij can understand, it will then show up in
Code Styles > Manage
If your XML is in different format, try to match tags with one of pre-defined styles(also XML)