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xml
Three XML files: xml_basic is a short valid document at 144 bytes, xml_nested has elements inside elements at 171 bytes, and xml_invalid is broken on purpose at 80 bytes, with a tag that is never closed. XML is strict, so one mistake makes the whole document unreadable, and parsers report this in very different ways. Use the valid files to test imports, feeds and configuration loading, and the invalid one to check for a clear error message. It is also worth confirming your parser limits entity expansion and external references, which are well-known XML attack routes.