Ultra-fast XML parser and XPath 1.0 engine for Elixir — a Rust NIF with SIMD-accelerated zero-copy structural index. 100% W3C/OASIS conformance (1089/1089). 8-72x faster, 89-100x less memory than SweetXml. Drop-in replacement for SweetXml and Saxy with sigils, SAX, streaming, and encoding.