B4J Question [Answered][B4X] AdditionalJar vs. Library Reference

AFAIK the xml file that accompanies a library file actually informs the IDE of what functions are available within the library and so it can show it in autocomplete.

An Additional jar is just added to the classpath, and the IDE has no idea what is inside.

AdditionalJar just tells the compiler to add a reference to that resource during compilation. The compiler doesn't know anything about that jar. In most cases you will use inline Java or JavaObject to access it.

A standard library is made of two files: the jar file and a xml file. The xml file includes all the information that the compiler needs to know about the library and allows you to write code that directly accesses the library.

Thank You Both @Daestrum & @Erel!
Now the scene is clear!