create flat OPC from DOCX using Saxon 9.8 + EXPath

Cf. #36
See also #29

docx.xsl

@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+  xmlns:archive="http://expath.org/ns/archive"
+  xmlns:file="http://expath.org/ns/file"
+  exclude-result-prefixes="#all"
+  version="3.0">
+
+  <xsl:output indent="1" />
+  <xsl:param name="filename" />
+  <xsl:variable name="zip" select="file:read-binary($filename)" />
+
+  <xsl:template match="/">
+    <pkg:package
+      xmlns:pkg="http://schemas.microsoft.com/office/2006/xmlPackage">
+      <!--<xsl:sequence select="parse-xml(archive:extract-text($zip, 'word/document.xml'))" />
+      <xsl:sequence select="parse-xml(archive:extract-text($zip, 'word/comments.xml'))" />
+      <xsl:sequence select="parse-xml(archive:extract-text($zip, 'word/endnotes.xml'))" />
+      <xsl:sequence select="parse-xml(archive:extract-text($zip, 'word/footnotes.xml'))" />
+      <xsl:sequence select="parse-xml(archive:extract-text($zip, 'word/numbering.xml'))" />
+      <xsl:sequence select="parse-xml(archive:extract-text($zip, 'word/_rels/endnotes.xml.rels'))" />
+      <xsl:sequence select="parse-xml(archive:extract-text($zip, 'word/_rels/document.xml.rels'))" />-->
+
+      <xsl:variable name="parts" select="('word/document.xml', 'word/comments.xml', 'word/endnotes.xml',
+        'word/footnotes.xml', 'word/numbering.xml', 'word/_rels/endnotes.xml.rels', 'word/_rels/document.xml.rels')" />
+      <xsl:for-each select="$parts">
+        <xsl:try>
+          <pkg:part>
+            <xsl:attribute name="pkg:name" select="'/' || ." />
+            <pkg:xmlData>
+              <xsl:sequence select="parse-xml(archive:extract-text($zip, .))" />
+            </pkg:xmlData>
+          </pkg:part>
+          <xsl:catch />
+        </xsl:try>
+      </xsl:for-each>
+    </pkg:package>
+  </xsl:template>
+</xsl:stylesheet>