The format of those files are not properly documented but should be to document how they are supposed to be used together with vault and/or content-packages. I found the following usages:
- config.xml: used for the exporter, defines handlers and aggregators and generic properties (currently only "useBinaryReferences")
- settings.xml: mainly used for the vlt-cli, xml file only consisting out of ignore elements containing one attribute named name, unclear where it is used.
- nodetypes.cnd: only considered during import, will register all node types
- privileges.xml: only considered during import, will implicitly register all custom privileges given