[gxml] Fixes to GomSerialization on GomBook

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit 7c81a3120183314ce2e0506c45ac58183bbff460
Author: Daniel Espinosa <esodan gmail com>
Date:   Mon Dec 12 23:35:11 2016 -0600

    Fixes to GomSerialization on GomBook

 test/GomSerializationTest.vala |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/test/GomSerializationTest.vala b/test/GomSerializationTest.vala
index 46208a7..00c40c8 100644
--- a/test/GomSerializationTest.vala
+++ b/test/GomSerializationTest.vala
@@ -116,6 +116,9 @@ class GomResume : GomElement
 
 class GomBook : GomElement
 {
+  construct {
+    _local_name = "Book";
+  }
   [Description(nick="##Year")]
   public string year { get; set; }
   [Description(isbn="##ISBN")]