diff --git a/src/Orchard/Indexing/ISearchBits.cs b/src/Orchard/Indexing/ISearchBits.cs
new file mode 100644
index 000000000..b22765f78
--- /dev/null
+++ b/src/Orchard/Indexing/ISearchBits.cs
@@ -0,0 +1,8 @@
+namespace Orchard.Indexing {
+    public interface ISearchBits {
+        ISearchBits And(ISearchBits other);
+        ISearchBits Or(ISearchBits other);
+        ISearchBits Xor(ISearchBits other);
+        long Count();
+    }
+}