xmllite: Added IXmlResolver definition.

include/xmllite.idl

@@ -78,6 +78,21 @@ interface IXmlReader : IUnknown
     BOOL IsEOF(void);
 }
 
+/* IXmlResolver */
+[
+  local,
+  object,
+  uuid(7279fc82-709d-4095-b63d-69fe4b0d9030),
+  pointer_default(unique)
+]
+interface IXmlResolver : IUnknown
+{
+    HRESULT ResolveUri([in] LPCWSTR base_uri,
+                       [in] LPCWSTR public_id,
+                       [in] LPCWSTR system_id,
+                       [out] IUnknown **input);
+}
+
 /* IXmlReader state */
 typedef enum XmlReadState
 {