diff --git a/app-text/docbook-xml-4.5.PKGBUILD b/app-text/docbook-xml-4.5.PKGBUILD
new file mode 100644
index 0000000..2c48244
--- /dev/null
+++ b/app-text/docbook-xml-4.5.PKGBUILD
@@ -0,0 +1,149 @@
+pkgname=docbook-xml
+pkgver=4.5
+pkgdesc="A widely used XML scheme for writing documentation and help"
+homepage="https://www.oasis-open.org/docbook/"
+arch=(any)
+license=(MIT)
+sources=("${pkgname}-${pkgver}.zip")
+urls=("https://www.docbook.org/xml/${pkgver}/${sources[0]}")
+md5sums=("03083e288e87a7e829e437358da7ef9e")
+
+_compat_4x=(4.1.2 4.2 4.3 4.4)
+
+src_prepare() {
+  local z="${distdir}/${sources[0]}"
+  bsdtar -xf "$z"
+}
+
+src_install() {
+  local dtd_dir="${pkgdir}/usr/share/xml/docbook/xml-dtd-${pkgver}"
+  local etc_xml="${pkgdir}/etc/xml"
+  local cat_docbook="${etc_xml}/docbook"
+
+  install -v -d -m755 "$dtd_dir"
+  cp -v -af --no-preserve=ownership docbook.cat *.dtd ent/ *.mod "$dtd_dir"
+
+  install -v -d -m755 "$etc_xml"
+  xmlcatalog --noout --create "$cat_docbook"
+
+  xmlcatalog --noout --add "public" \
+    "-//OASIS//DTD DocBook XML V${pkgver}//EN" \
+    "http://www.oasis-open.org/docbook/xml/${pkgver}/docbookx.dtd" \
+    "$cat_docbook"
+
+  xmlcatalog --noout --add "public" \
+    "-//OASIS//DTD DocBook XML CALS Table Model V${pkgver}//EN" \
+    "file:///usr/share/xml/docbook/xml-dtd-${pkgver}/calstblx.dtd" \
+    "$cat_docbook"
+
+  xmlcatalog --noout --add "public" \
+    "-//OASIS//DTD XML Exchange Table Model 19990315//EN" \
+    "file:///usr/share/xml/docbook/xml-dtd-${pkgver}/soextblx.dtd" \
+    "$cat_docbook"
+
+  xmlcatalog --noout --add "public" \
+    "-//OASIS//ELEMENTS DocBook XML Information Pool V${pkgver}//EN" \
+    "file:///usr/share/xml/docbook/xml-dtd-${pkgver}/dbpoolx.mod" \
+    "$cat_docbook"
+
+  xmlcatalog --noout --add "public" \
+    "-//OASIS//ELEMENTS DocBook XML Document Hierarchy V${pkgver}//EN" \
+    "file:///usr/share/xml/docbook/xml-dtd-${pkgver}/dbhierx.mod" \
+    "$cat_docbook"
+
+  xmlcatalog --noout --add "public" \
+    "-//OASIS//ELEMENTS DocBook XML HTML Tables V${pkgver}//EN" \
+    "file:///usr/share/xml/docbook/xml-dtd-${pkgver}/htmltblx.mod" \
+    "$cat_docbook"
+
+  xmlcatalog --noout --add "public" \
+    "-//OASIS//ENTITIES DocBook XML Notations V${pkgver}//EN" \
+    "file:///usr/share/xml/docbook/xml-dtd-${pkgver}/dbnotnx.mod" \
+    "$cat_docbook"
+
+  xmlcatalog --noout --add "public" \
+    "-//OASIS//ENTITIES DocBook XML Character Entities V${pkgver}//EN" \
+    "file:///usr/share/xml/docbook/xml-dtd-${pkgver}/dbcentx.mod" \
+    "$cat_docbook"
+
+  xmlcatalog --noout --add "public" \
+    "-//OASIS//ENTITIES DocBook XML Additional General Entities V${pkgver}//EN" \
+    "file:///usr/share/xml/docbook/xml-dtd-${pkgver}/dbgenent.mod" \
+    "$cat_docbook"
+
+  xmlcatalog --noout --add "rewriteSystem" \
+    "http://www.oasis-open.org/docbook/xml/${pkgver}" \
+    "file:///usr/share/xml/docbook/xml-dtd-${pkgver}" \
+    "$cat_docbook"
+
+  xmlcatalog --noout --add "rewriteURI" \
+    "http://www.oasis-open.org/docbook/xml/${pkgver}" \
+    "file:///usr/share/xml/docbook/xml-dtd-${pkgver}" \
+    "$cat_docbook"
+
+  for DTDVERSION in "${_compat_4x[@]}"; do
+    xmlcatalog --noout --add "public" \
+      "-//OASIS//DTD DocBook XML V${DTDVERSION}//EN" \
+      "http://www.oasis-open.org/docbook/xml/${DTDVERSION}/docbookx.dtd" \
+      "$cat_docbook"
+
+    xmlcatalog --noout --add "rewriteSystem" \
+      "http://www.oasis-open.org/docbook/xml/${DTDVERSION}" \
+      "file:///usr/share/xml/docbook/xml-dtd-${pkgver}" \
+      "$cat_docbook"
+
+    xmlcatalog --noout --add "rewriteURI" \
+      "http://www.oasis-open.org/docbook/xml/${DTDVERSION}" \
+      "file:///usr/share/xml/docbook/xml-dtd-${pkgver}" \
+      "$cat_docbook"
+  done
+
+  # Fix permissions
+  find "$pkgdir" -type f -exec chmod -c a-x {} +
+  chmod -Rc u=rwX,go=rX "$pkgdir"
+}
+
+src_postinstall() {
+  install -v -d -m755 /etc/xml
+
+  if [ ! -e /etc/xml/catalog ]; then
+    xmlcatalog --noout --create /etc/xml/catalog
+  fi
+
+  xmlcatalog --noout --add "delegatePublic" \
+    "-//OASIS//ENTITIES DocBook XML" \
+    "file:///etc/xml/docbook" \
+    /etc/xml/catalog
+
+  xmlcatalog --noout --add "delegatePublic" \
+    "-//OASIS//DTD DocBook XML" \
+    "file:///etc/xml/docbook" \
+    /etc/xml/catalog
+
+  xmlcatalog --noout --add "delegateSystem" \
+    "http://www.oasis-open.org/docbook/" \
+    "file:///etc/xml/docbook" \
+    /etc/xml/catalog
+
+  xmlcatalog --noout --add "delegateURI" \
+    "http://www.oasis-open.org/docbook/" \
+    "file:///etc/xml/docbook" \
+    /etc/xml/catalog
+
+  for DTDVERSION in "${_compat_4x[@]}"; do
+    xmlcatalog --noout --add "delegateSystem" \
+      "http://www.oasis-open.org/docbook/xml/${DTDVERSION}/" \
+      "file:///etc/xml/docbook" \
+      /etc/xml/catalog
+    xmlcatalog --noout --add "delegateURI" \
+      "http://www.oasis-open.org/docbook/xml/${DTDVERSION}/" \
+      "file:///etc/xml/docbook" \
+      /etc/xml/catalog
+  done
+}
+
+src_postremove() {
+  if [ -e /etc/xml/catalog ]; then
+    xmlcatalog --noout --del "file:///etc/xml/docbook" /etc/xml/catalog
+  fi
+}