Setting sql developer CONF file

I try to play around with its CONF file, and I have a difficulty understanding the language that is using. What language is this? I can only guess "sqldeveloper-debug.conf" is executed when I set "IncludeConfFile sqldeveloper-debug.conf" in sqldeveloper.conf. But I don't really know what those configuration files do. Could you give me some guidelines to learn this?
Best regards,
Valerie

I got it, the configuration files pass arguments to Java Virtual machine......

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