SEO: richer titles for 230 reference pages, categorized hub, cross-linking

Function pages ranked at pos 7-9 with 1.2% CTR (6.2k impressions/90d) and
the version pages sat at pos 22-24 with almost no internal links.

- Function/element pages: SERP title now "name — XPath function: syntax &
  examples" (one layout change, applies to all 230 pages)
- Reference hub: own title, intro copy, category sections with anchor nav
  (was a flat 230-item list ranking at pos 29.7)
- Cross-linking: version badge on every reference page links to its
  /xslt-2-0/ / /xslt-3-0/ page (~160 new internal links); version pages
  link back to the hub + 6 popular entries each; homepage links the hub

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MgybX3QbAWVzb9ZnroCA79

site/layouts/xslt/functions/list.html

@@ -1,14 +1,30 @@
+{{ define "title" }}XSLT & XPath Function Reference — {{ len .Pages }}+ functions with runnable examples | {{ .Site.Title }}{{ end }}
 {{ define "main" }}
 <div class="page-header">
   <h1>XSLT &amp; XPath Function Reference</h1>
-  <p class="lead">Complete reference for XSLT elements and XPath functions, organized by version. Each entry includes syntax, parameters, and runnable examples.</p>
+  <p class="lead">Complete reference for {{ len .Pages }}+ XSLT elements and XPath functions across XSLT 1.0, 2.0 and 3.0. Every entry includes the syntax, a plain-English description, and a runnable example you can open directly in the <a href="https://xsltplayground.com/">online XSLT editor</a> — no install needed.</p>
 </div>
 
 {{ $elements := where .Pages "Params.category" "element" }}
 {{ $functions := where .Pages "Params.category" "ne" "element" }}
+{{ $cats := slice }}
+{{ range $functions }}{{ with .Params.category }}{{ $cats = $cats | append . }}{{ end }}{{ end }}
+{{ $cats = uniq $cats | sort }}
+
+<nav class="ref-toc" aria-label="Reference categories">
+  <strong>Jump to:</strong>
+  <a href="#xslt-elements">XSLT Elements ({{ len $elements }})</a>
+  {{ range $cats }}
+  <a href="#{{ . | urlize }}">{{ humanize . }}s ({{ len (where $functions "Params.category" .) }})</a>
+  {{ end }}
+</nav>
+
+<div class="content ref-intro">
+  <p>Looking for how a specific XSLT instruction or XPath function works? This reference covers the <strong>string, numeric, boolean, date, node, sequence, map, array, JSON and higher-order functions</strong> available in each XSLT version, plus every <strong>XSLT element</strong> from <code>xsl:template</code> to <code>xsl:accumulator</code>. Entries marked <em>XSLT 2.0</em> or <em>XSLT 3.0</em> require a processor such as Saxon — exactly what <a href="https://xsltplayground.com/">XSLT Playground</a> runs, so you can verify behaviour before shipping.</p>
+</div>
 
 {{ if $elements }}
-<section class="ref-section">
+<section class="ref-section" id="xslt-elements">
   <h2>XSLT Elements</h2>
   <ul class="ref-index-list">
     {{ range $elements }}
@@ -22,11 +38,11 @@
 </section>
 {{ end }}
 
-{{ if $functions }}
-<section class="ref-section">
-  <h2>XPath Functions</h2>
+{{ range $cat := $cats }}
+<section class="ref-section" id="{{ $cat | urlize }}">
+  <h2>{{ humanize $cat }}s</h2>
   <ul class="ref-index-list">
-    {{ range $functions }}
+    {{ range where $functions "Params.category" $cat }}
     <li>
       <a href="{{ .RelPermalink }}">{{ .Title }}</a>
       {{ with .Params.versionLabel }}<span class="ref-badge ref-badge--sm">{{ . }}</span>{{ end }}

site/layouts/xslt/functions/single.html

@@ -1,9 +1,15 @@
+{{ define "title" }}{{ .Title }} — {{ if eq .Params.category "element" }}XSLT element{{ else }}XPath function{{ end }}: syntax & examples | {{ .Site.Title }}{{ end }}
 {{ define "main" }}
 <article class="post ref-page">
   <p class="eyebrow">XSLT Reference</p>
   <h1>{{ .Title }}</h1>
   <div class="ref-meta">
-    {{ with .Params.versionLabel }}<span class="ref-badge">{{ . }}</span>{{ end }}
+    {{ with .Params.versionLabel }}
+    {{ $verUrl := "https://xsltplayground.com/" }}
+    {{ if eq . "XSLT 2.0" }}{{ $verUrl = "https://xsltplayground.com/xslt-2-0/" }}{{ end }}
+    {{ if eq . "XSLT 3.0" }}{{ $verUrl = "https://xsltplayground.com/xslt-3-0/" }}{{ end }}
+    <a class="ref-badge" href="{{ $verUrl }}" title="Test {{ . }} online">{{ . }}</a>
+    {{ end }}
     {{ with .Params.category }}<span class="ref-badge ref-badge--cat">{{ . }}</span>{{ end }}
   </div>
   {{ with .Description }}<p class="lead">{{ . }}</p>{{ end }}