Static xmlParserVersion 

#[unsafe(no_mangle)]
pub static mut xmlParserVersion: *const c_char

const char *xmlParserVersion (default “21503” — upstream LIBXML_VERSION_STRING)

SAFETY: the pointed-to string is a static, immutable, null-terminated literal; static mut is used because C raw pointers are not Sync. Reads/writes of the pointer itself are racy only if C code mutates it (upstream treats it as a constant).