- Eval-time prefix bindings: Query.evaluate(over:namespaces:) and
value(at:...:namespaces:) supply prefix to URI bindings, so a name test
like q:item resolves q to a URI and matches by namespace regardless of
the document's own prefix. The match is namespace-aware only when
bindings are present, so existing unprefixed/prefix-string queries are
unchanged.
- XPointer schemes: xpath1() evaluates an XPath expression (like
xpointer()), and xmlns(p=uri) binds a prefix for the expression parts
that follow it, threaded into the XPath evaluation.
The range() scheme (and so XInclude range inclusion) remains.
Part of #88
Compile and evaluate full XPath 1.0 expressions, not just location paths.
Add the four-type Value (node-set, boolean, number, string) with the spec's
coercion rules and canonical number formatting, a recursive-descent parser
for the operator grammar (or/and, equality, relational, additive,
multiplicative, unary minus, union) whose grammatical position disambiguates
* and the operator keywords, function calls, variable references, and filter
expressions. Predicates are now arbitrary expressions (a numeric predicate
is a position test). Comparison follows the node-set quantification rules.
Query gains value/number/string/boolean accessors and a $variable binding
map; the core functions last, position, count, not, true, false, boolean,
number, and string ship with it.
Closes#42
