b4xlibs do not require an XML file. The IDE parses the packed code modules. With this tool you can generate the XML from the packed source code. It is useful for documentation purposes as there are tools that expect this XML. For example...
www.b4x.com
All worked except KeyValueStore.b4xlib which produces an error in the Archiver at line 38 in the XMLGenerator module.
B4X:
a.UnZip("", b4xlib, TempFolder, "") ' Error here at line 38
java.io.IOException: java.util.zip.ZipException: invalid entry size (expected 0 but got 163 bytes)
It looks like either the Archiver can't cope with however that b4xlib was compressed or whatever compressed it did it wrong, but in a way that other utilities, like 7-Zip don't mind.