Converter - Selector Conformance

The converter implements a streaming XPath-shaped selector subset, not a full XPath 1.0 evaluator.

Capability	Status	Public behavior
Absolute child paths	Supported	/a/b/c
Leading descendant path	Supported	//item/name; nested // is rejected.
Relative contextual path	Supported	./name inside an object or array item.
Current contextual element	Supported	.
Attribute terminal	Supported	./@id
Direct text terminal	Supported	./text()
Positive positional predicate	Supported	item[2]; positions are 1-based.
Qualified names	Lexical	p:item matches the exact XML QName. There is no external namespace binding option.
Wildcards and arbitrary predicates	Unsupported	Rejected before parsing.
Axes, unions, operators, variables	Unsupported	Rejected before parsing.
XPath function library	Unsupported	No general function evaluator or tree fallback is included.
DOM/tree materialization	Not used	All supported selectors run over streaming tokens.

Unsupported expressions throw with a specific reason during schema construction. Adding a new selector form is backward-compatible, but the table above is the 1.0 contract.