xslt 1.8.0

This package has no dependencies.

Minor rather than patch: two behaviour changes, both spec-correct, both able to change what an
existing stylesheet does. **Read the first section before upgrading.**

Takes **PhoenixmlDb.XQuery 1.8.0** and PhoenixmlDb.Core 1.7.0.

### Behaviour changes — read this before upgrading

**1. `streamable="true"` and `streamable="1"` are now honoured.**

XSLT 3.0 types `@streamable` as a boolean, but previous releases compared it against the literal
string `"yes"`. Any other spelling — including `true`, `1`, and `yes` with surrounding whitespace —
was silently treated as not streamable, and such stylesheets ran unstreamed.

**If you use one of these spellings, this release changes how your stylesheet executes.** It will
now genuinely stream, which is faster and uses less memory, but streaming support has known gaps
that unstreamed execution does not: some constructs produce different output rather than raising
an error. If you see unexpected results after upgrading, setting the mode or source-document to
`streamable="no"` restores the previous behaviour, and we would like to hear about the case.

Of the nineteen conformance cases this change exposed, **eleven are already fixed in this same
release** — the change and most of its fallout ship together.

**2. Built-in functions now enforce declared argument cardinality** (from PhoenixmlDb.XQuery
1.8.0). `substring('abc', ())` now raises `XPTY0004` rather than returning `""`. This applies to
every built-in; see that package's notes.

### Silent wrong answers — fixed

Each of these produced a well-formed, plausible result with no error.

- **A streaming aggregate answered from nothing.** Under a streamable mode, a `match="/"` template
 aggregating over the stream computed from no input at all: `count(//PRICE)` gave `0`,
 `sum(//PRICE)` gave empty, whatever the document held. This is the default CLI path —
 `--no-stream` gave the same wrong answers.
- **`xsl:function cache="yes"` returned other calls' results.** The memo key was a string
 concatenation, so `f((1,2))` and `f((3,4))` shared an entry, as did `f('1')` and `f(1)`. Present
 in every release since 1.1.0.
- **Accumulators read a later-declared accumulator one node late.** End-phase rules ran in
 declaration order, so reading another accumulator's after-value at the same node returned the
 *previous* node's value. Declaration order decided correctness. Also present since 1.1.0. A
 two-accumulator cycle now correctly raises `XTDE3400` instead of resolving to stale data.
- **`xsl:function` declared `as="item()*"` silently lost element nodes.** Writing the type
 explicitly — the careful habit — selected the broken path; omitting `as` worked.
- **`xsl:merge` silently merged one of two sources.** A relative `for-each-source` URI resolved
 against the wrong base, and an unretrievable source was skipped without an error. Now
 `FODC0002`.
- **`xsl:text` moved to the end of any untyped variable.**
- **Streamed shallow-copy produced malformed XML** — siblings nested inside one another, with the
 outer element left unclosed.
- **`fn:serialize` emitted `xmlns:p=""`**, so its output did not reparse.

### Added

- **`xsl:mode warning-on-no-match` now warns.** It was parsed, validated, and discarded. The
 built-in template rule is silent by design, so a node no template matched yields text where
 markup was expected with no indication — this is the mechanism for catching that.

### Also fixed

- `xsl:merge` key comparison uses the key's collation rather than codepoint order.
- `xsl:merge` rejects a streamable source that crawls or sorts; duration keys compare by length.
- A schema importing the XML namespace without a location now loads — previously
 `xsl:import-schema` failed outright and the stylesheet would not load at all.
- Abstract component invocation raises `XTDE3052` rather than "not found".
- Numerous error codes corrected: `XTSE3430`, `XTDE3362`, `XTDE3160`, `XTTE3210`, `XTSE3155`,
 `XTSE3080`, `SESU0013`, `XTSE0010`, `XTSE0730`, `XTDE1162`, `XTSE2210`, `XTDE3510`.
- Streaming: ancestors are linked on the striding path, `position()` counts per parent, a
 suppressed subtree no longer closes its ancestor early, and a matched element's children are
 delivered rather than dropped.
- CLI: an `xsl:result-document` `href` that is already a URI is written to the right path.

### Conformance

**W3C XSLT 3.0: 10,292/10,630 (96.82%)** — a full-corpus run at the exact commit tagged for this
release, 2026-09-13, against `xslt30-test` @ `fddf1cf` in a Release build.

W3C QT3 **29,534/31,414 (94.02%)**, measured 2026-09-11 against `qt3tests` @ `201a6e4` from the
committed per-set baseline. That figure predates this release's XQuery bump and is a floor.

The engine pin moved from `PhoenixmlDb.XQuery` 1.7.0 to 1.8.0 in this release, and that bump was
measured as its own change: **full corpus at both commits, no per-set differences.** The
built-in cardinality change reaches nothing the XSLT corpus exercises.