schema: domain: Accept VMware disk sources for the disk

Accept the 'datastore' variant of disk source specification used by our
VMware driver.

https://libvirt.org/drvesx.html#datastore

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Pino Toscano <ptoscano@redhat.com>

docs/schemas/basictypes.rng

@@ -303,6 +303,12 @@
     </data>
   </define>
 
+  <define name="vmwarePath">
+    <data type="string">
+      <param name="pattern">\[[^\]]+\] .+</param>
+    </data>
+  </define>
+
   <define name="absDirPath">
     <data type="string">
       <param name="pattern">/.*</param>

docs/schemas/domaincommon.rng

@@ -1652,7 +1652,10 @@
         <interleave>
           <optional>
             <attribute name="file">
-              <ref name="absFilePath"/>
+              <choice>
+                <ref name="absFilePath"/>
+                <ref name="vmwarePath"/>
+              </choice>
             </attribute>
           </optional>
           <ref name="diskSourceCommon"/>