diff --git a/base_classes/NXpdb.nxdl.xml b/base_classes/NXpdb.nxdl.xml
index 70e22edd6c..3bb17550a2 100644
--- a/base_classes/NXpdb.nxdl.xml
+++ b/base_classes/NXpdb.nxdl.xml
@@ -24,7 +24,6 @@
 <definition xmlns="http://definition.nexusformat.org/nxdl/3.1"
 	category="base"
 	name="NXpdb"
-	version="1.0"
 	type="group"
 	extends="NXobject"
 	ignoreExtraGroups="true"
@@ -157,16 +156,16 @@
 			2 no no FVNQHLCGSHLVEALYLVCGERGFFYTPKA FVNQHLCGSHLVEALYLVCGERGFFYTPKA
 			polypeptide(L)
 
-	       which converts to::
+		which converts to::
 
-	       entity_poly:NXpdb
-		 @NXpdb_class:CBF_cbfcat
-		 entity_id:["1", "2"]
-		 nstd_linkage:["no", "no"]
-		 nstd_monomer:["no", "no"]
-		 pdbx_seq_one_letter_code:["GIVEQCCTSICSLYQLENYCN","FVNQHLCGSHLVEALYLVCGERGFFYTPKA"]
-		 pdbx_seq_one_letter_code_can:["GIVEQCCTSICSLYQLENYCN","FVNQHLCGSHLVEALYLVCGERGFFYTPKA"]
-		 type:["polypeptide(L)", "polypeptide(L)"]
+			entity_poly:NXpdb
+			  @NXpdb_class:CBF_cbfcat
+			  entity_id:["1", "2"]
+			  nstd_linkage:["no", "no"]
+			  nstd_monomer:["no", "no"]
+			  pdbx_seq_one_letter_code:["GIVEQCCTSICSLYQLENYCN","FVNQHLCGSHLVEALYLVCGERGFFYTPKA"]
+			  pdbx_seq_one_letter_code_can:["GIVEQCCTSICSLYQLENYCN","FVNQHLCGSHLVEALYLVCGERGFFYTPKA"]
+			  type:["polypeptide(L)", "polypeptide(L)"]