Module ast 

XPath 1.0 Expression AST (§25).

Internal Rust representation of XPath expressions, separate from the C ABI. The parser builds this AST; the evaluator walks it.

UPSTREAM-PARITY

Covers the full XPath 1.0 grammar:

• Location paths (relative/absolute, steps, axes, node tests, predicates)
• Operators (union, comparison, boolean, arithmetic)
• Functions, variables, literals
• Filter expressions (primary with predicates)

Structs

CompiledExpr

A compiled XPath expression.

Step

A single location step: axis::node-test[predicates]

Enums

Axis

XPath 1.0 axis.

BinaryOp

Expr

XPath expression AST node.

NameTest

A name test (QName or wildcard).

NodeTest

XPath node test.