added spec for opkg PURL type

PURL-TYPES.rst

@@ -397,20 +397,6 @@ nuget
 
       pkg:nuget/[email protected]
 
-qpkg
-----
-``qpkg`` for QNX packages:
-
-- There is no default package repository: this should be implied either from
-  the ``namespace`` or using a repository base URL as ``repository_url``
-  qualifiers key.
-- The ``namespace`` is the vendor of the package. It is not case sensitive and must be
-  lowercased.
-- Examples::
-
-      pkg:qpkg/blackberry/[email protected]
-      pkg:qpkg/blackberry/[email protected]
-
 oci
 ------------
 ``oci`` for all artifacts stored in registries that conform to the
@@ -441,6 +427,23 @@ including container images built by Docker and others:
       pkg:oci/static@sha256%3A244fd47e07d10?repository_url=gcr.io/distroless/static&tag=latest
       pkg:oci/hello-wasm@sha256%3A244fd47e07d10?tag=v1
 
+opkg
+----
+
+``opkg`` for OpenWrt and Entware packages:
+
+- There is no default repository. This should be implied by the ``namespace`` together with the ``repo`` and ``arch`` qualifiers.
+- The ``namespace`` is the vendor of the package, such as ``openwrt`` or ``entware``. It is not case sensitive and must be
+  lowercased.
+- The ``set`` qualifier should be used to designate the collection of packages from which the package in question is drawn, such as ``base``, ``community-packages``, ``luci``, ``routing``, or ``telephony``. (OpenWrt refers to this as the package's "repository".)
+- The ``name`` is the name of the package. It is case sensitive.
+- The ``version`` is the version of the package. It is case sensitive.
+- The ``arch`` is the architecture for which the package is built. It is case sensitive. 
+- Examples::
+
+    pkg:opkg/openwrt/[email protected]?arch=mipsel_74kc&set=telephony
+    pkg:opkg/openwrt/[email protected]?arch=powerpc&set=base
+
 pub
 ----
 ``pub`` for Dart and Flutter packages:
@@ -466,6 +469,20 @@ pypi
       pkg:pypi/[email protected]
       pkg:pypi/[email protected]
 
+qpkg
+----
+``qpkg`` for QNX packages:
+
+- There is no default package repository: this should be implied either from
+  the ``namespace`` or using a repository base URL as ``repository_url``
+  qualifiers key.
+- The ``namespace`` is the vendor of the package. It is not case sensitive and must be
+  lowercased.
+- Examples::
+
+      pkg:qpkg/blackberry/[email protected]
+      pkg:qpkg/blackberry/[email protected]
+
 rpm
 ---
 ``rpm`` for RPMs:
@@ -556,7 +573,6 @@ Other candidate types to define:
 - ``nim`` for Nim packages:
 - ``nix`` for Nixos packages:
 - ``opam`` for OCaml packages:
-- ``openwrt`` for OpenWRT packages:
 - ``osgi`` for OSGi bundle packages:
 - ``p2`` for Eclipse p2 packages:
 - ``pear`` for Pear PHP packages: