diff --git a/Documentation/Models/Docbook/Book/Part.ent b/Documentation/Models/Docbook/Book/Part.ent
new file mode 100644
index 0000000..7502d02
--- /dev/null
+++ b/Documentation/Models/Docbook/Book/Part.ent
@@ -0,0 +1,8 @@
+<!-- Begin: Part entities definition -->
+<!-- End: Part entities definition -->
+
+<!-- Begin: Chapter entities definition -->
+<!-- End: Chapter entities definition -->
+
+<!-- Begin: Section entities definition -->
+<!-- End: Section entities definition -->