docbook_xml*: fix source not found

pkgs/data/sgml+xml/schemas/xml-dtd/docbook/4.1.2.nix

@@ -7,11 +7,11 @@
 }:
 
 let
-  # Urgh, DocBook 4.1.2 doesn't come with an XML catalog.  Use the one
+  # Urgh, DocBook 4.1.2 doesn't come with an XML catalog. Use the one
   # from 4.2.
   docbook42catalog = fetchurl {
-    url = "https://docbook.org/xml/4.2/catalog.xml";
-    sha256 = "18lhp6q2l0753s855r638shkbdwq9blm6akdjsc9nrik24k38j17";
+    url = "https://www.oasis-open.org/docbook/xml/4.2/catalog.xml";
+    hash = "sha256-J0g0JhEzZpuYlm0qU+lKmLc1oUbD5FKQHuUAKrC5kKI=";
   };
 in
 
@@ -19,14 +19,13 @@ import ./generic.nix {
   inherit
     lib
     stdenv
+    fetchurl
     unzip
     findXMLCatalogs
     ;
   version = "4.1.2";
-  src = fetchurl {
-    url = "https://docbook.org/xml/4.1.2/docbkx412.zip";
-    sha256 = "0wkp5rvnqj0ghxia0558mnn4c7s3n501j99q2isp3sp0ci069w1h";
-  };
+  url = "https://www.oasis-open.org/docbook/xml/4.1.2/docbkx412.zip";
+  hash = "sha256-MPBkQGTg6nF1FDglGUCxQx9GrK2oFKBihw9IbHcud3I=";
   postInstall = "
     sed 's|V4.2|V4.1.2|g' < ${docbook42catalog} > catalog.xml
   ";

pkgs/data/sgml+xml/schemas/xml-dtd/docbook/4.2.nix

@@ -10,12 +10,10 @@ import ./generic.nix {
   inherit
     lib
     stdenv
+    fetchurl
     unzip
     findXMLCatalogs
     ;
   version = "4.2";
-  src = fetchurl {
-    url = "https://docbook.org/xml/4.2/docbook-xml-4.2.zip";
-    sha256 = "acc4601e4f97a196076b7e64b368d9248b07c7abf26b34a02cca40eeebe60fa2";
-  };
+  hash = "sha256-rMRgHk+XoZYHa35ks2jZJIsHx6vyazSgLMpA7uvmD6I=";
 }

pkgs/data/sgml+xml/schemas/xml-dtd/docbook/4.3.nix

@@ -10,12 +10,10 @@ import ./generic.nix {
   inherit
     lib
     stdenv
+    fetchurl
     unzip
     findXMLCatalogs
     ;
   version = "4.3";
-  src = fetchurl {
-    url = "https://docbook.org/xml/4.3/docbook-xml-4.3.zip";
-    sha256 = "0r1l2if1z4wm2v664sqdizm4gak6db1kx9y50jq89m3gxaa8l1i3";
-  };
+  hash = "sha256-IwaKlOpv1ISwBMWnPsNqZqpH6o8Na2LMFpWTH1wUNGQ=";
 }

pkgs/data/sgml+xml/schemas/xml-dtd/docbook/4.4.nix

@@ -10,12 +10,10 @@ import ./generic.nix {
   inherit
     lib
     stdenv
+    fetchurl
     unzip
     findXMLCatalogs
     ;
   version = "4.4";
-  src = fetchurl {
-    url = "https://docbook.org/xml/4.4/docbook-xml-4.4.zip";
-    sha256 = "141h4zsyc71sfi2zzd89v4bb4qqq9ca1ri9ix2als9f4i3mmkw82";
-  };
+  hash = "sha256-AvFZ64jEJU2V6DHFHBRLGGOyFtkJtf9FdDoc5vUnMJA=";
 }

pkgs/data/sgml+xml/schemas/xml-dtd/docbook/4.5.nix

@@ -10,12 +10,10 @@ import ./generic.nix {
   inherit
     lib
     stdenv
+    fetchurl
     unzip
     findXMLCatalogs
     ;
   version = "4.5";
-  src = fetchurl {
-    url = "https://docbook.org/xml/4.5/docbook-xml-4.5.zip";
-    sha256 = "1d671lcjckjri28xfbf6dq7y3xnkppa910w1jin8rjc35dx06kjf";
-  };
+  hash = "sha256-Tk4DeiuDyYxslIGDkNS90/bhD27GLdeRiFlOJhkNx7Q=";
 }

pkgs/data/sgml+xml/schemas/xml-dtd/docbook/generic.nix

@@ -2,10 +2,15 @@
   lib,
   stdenv,
   unzip,
-  src,
-  version,
-  postInstall ? "true",
+  fetchurl,
   findXMLCatalogs,
+  src ? fetchurl {
+    inherit hash url;
+  },
+  version,
+  hash ? "",
+  url ? "https://www.oasis-open.org/docbook/xml/${version}/docbook-xml-${version}.zip",
+  postInstall ? "true",
 }:
 
 stdenv.mkDerivation {