Expand description
XPath 1.0 implementation (§25, §85 Phase 5).
Complete XPath 1.0 engine: location paths, axes, node tests, predicates, functions, variables, namespaces, node sets, boolean/number/string conversion, comparison semantics, NaN/infinity/negative zero, document order, context position/size, extension functions, compiled expressions.
Phase 0: scaffolded. Implementation begins in Phase 5.