XSLT

Versions

SupXML ships XSLT 1.0 fully and XSLT 2.0 at ~96.1% conformance on the W3C XSLT 3.0 test suite (4510 / 4692 attempted 2.0+ cases). The engine selects the version from the stylesheet’s version= attribute — version="2.0" opts in to the 2.0 instruction set (xsl:function, xsl:analyze-string, xsl:for-each-group, xsl:perform-sort, xsl:next-match, xsl:try / xsl:catch, sequence types, as= typing, etc.), and the XPath 2.0 expression layer is enabled automatically inside it.

Substantial XSLT 3.0 surface is implemented too: maps, arrays, higher- order functions, xsl:iterate, xsl:merge, xsl:accumulator, xsl:mode, xsl:evaluate, xsl:source-document, structured err:code / err:module reflection on caught errors, partial xsl:package + xsl:use-package linking, JSON (fn:parse-json, fn:xml-to-json, fn:json-to-xml, fn:json-doc). Things that require XSD 1.1-style schema integration (true xs:assertion / conditional type assignment driven from XPath assertions, streamable analysis) are not implemented; the engine produces correct non- streamed output for streamable stylesheets so conforming stylesheets behave identically.

Compile and apply

use sup_xml::{parse_str, ParseOptions};
use sup_xml::xslt::Stylesheet;

let xsl = r#"<xsl:stylesheet version="1.0"
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:template match="/catalog">
    <ul><xsl:for-each select="book"><li id="{@id}"/></xsl:for-each></ul>
  </xsl:template>
</xsl:stylesheet>"#;

let style = Stylesheet::compile_str(xsl)?;
let doc = parse_str("<catalog><book id='b1'/></catalog>",
    &ParseOptions { namespace_aware: true, ..Default::default() })?;
let result = style.apply(&doc)?;

println!("{}", result.to_string()?);

EXSLT

All EXSLT functions (math, date, str, set) are available without registration.

Schematron

Schematron compiles to XSLT and runs through the same engine:

use sup_xml::xslt::schematron::Schematron;

let sch = Schematron::compile_str(r#"
    <sch:schema xmlns:sch="http://purl.oclc.org/dsdl/schematron">
      <sch:pattern>
        <sch:rule context="book">
          <sch:assert test="@isbn">every book must have an ISBN</sch:assert>
        </sch:rule>
      </sch:pattern>
    </sch:schema>"#)?;

let report = sch.validate_str("<book/>")?;
assert!(!report.findings.is_empty());