Static xmlParserVersion 

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

const char *xmlParserVersion — matched to the system oracle build (libxml2 2.15.3 GIT build: LIBXML_VERSION_STRING “21503” plus the upstream version extra “-GITv2.15.3”).

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).