1 files changed, 11 insertions, 3 deletions
diff --git a/book.rnc b/book.rnc
index 8ede8da..ebec9f6 100644
--- a/book.rnc
+++ b/book.rnc
@@ -28,10 +28,18 @@ sections =
   }
 sections.attlist &= empty
 section =
-  element section { section.attlist, title, (body+ | subsection+) }
-subsection = element subsection { subsection.attlist, title?, body+ }
+  element section {
+    section.attlist,
+    (\include
+     | (title, (body+ | subsection+)))
+  }
+subsection =
+  element subsection {
+    subsection.attlist,
+    (\include | (title?, body+))
+  }
 subsection.attlist &=
   attribute id { text }?,
   attribute test { text }?
-body = element body { body.attlist, block.class+ }
+body = element body { body.attlist, (\include | block.class+) }
 start = glepindex | book | included | sections | summary