Allow <oor:items> in .xcd too

Can't remember a good reason not to.

Change-Id: Ie2c62783465b917696d19e66159b5862512c7a54
Reviewed-on: https://gerrit.libreoffice.org/70655
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

configmgr/source/xcdparser.cxx

@@ -127,7 +127,7 @@ bool XcdParser::startElement(
                 reader, nsId, name, existingDependencies);
         }
         if (nsId == ParseManager::NAMESPACE_OOR &&
-            name.equals("component-data"))
+            (name.equals("component-data") || name.equals("items")))
         {
             nestedParser_ = new XcuParser(layer_ + 1, data_, nullptr, nullptr, nullptr);
             nesting_ = 1;

officecfg/registry/component-update.dtd

@@ -97,9 +97,7 @@
         <!-- must syntactically match xs:integer and have a value in {0, ..., 8,
              11, 12, 14, ..., 31, 65534, 65535} -->
 
-<!-- oor:items is an alternative root element to oor:component-data (in plain
-     .xcu files only; not when nested in an .xcd file), used for the user-layer
-     registrymodifications.xcu: -->
+<!-- oor:items is an alternative root element to oor:component-data: -->
 
 <!ELEMENT oor:items (item*)>
 <!ATTLIST oor:items>