diff --git a/reference_files/1.0.0/anchor.asdf b/reference_files/1.0.0/anchor.asdf
new file mode 100644
index 00000000..5cd8cd88
--- /dev/null
+++ b/reference_files/1.0.0/anchor.asdf
@@ -0,0 +1,10 @@
+#ASDF 1.0.0
+#ASDF_STANDARD 1.0.0
+%YAML 1.1
+%TAG ! tag:stsci.edu:asdf/
+--- !core/asdf-1.0.0
+a: &id001 {abc: 123}
+asdf_library: !core/software-1.0.0 {author: The ASDF Developers, homepage: 'http://github.com/asdf-format/asdf',
+  name: asdf, version: 3.3.0}
+b: *id001
+...
diff --git a/reference_files/1.0.0/anchor.yaml b/reference_files/1.0.0/anchor.yaml
new file mode 100644
index 00000000..5cd8cd88
--- /dev/null
+++ b/reference_files/1.0.0/anchor.yaml
@@ -0,0 +1,10 @@
+#ASDF 1.0.0
+#ASDF_STANDARD 1.0.0
+%YAML 1.1
+%TAG ! tag:stsci.edu:asdf/
+--- !core/asdf-1.0.0
+a: &id001 {abc: 123}
+asdf_library: !core/software-1.0.0 {author: The ASDF Developers, homepage: 'http://github.com/asdf-format/asdf',
+  name: asdf, version: 3.3.0}
+b: *id001
+...
diff --git a/reference_files/1.0.0/ascii.asdf b/reference_files/1.0.0/ascii.asdf
index 4bcb6091..994d5989 100644
Binary files a/reference_files/1.0.0/ascii.asdf and b/reference_files/1.0.0/ascii.asdf differ
diff --git a/reference_files/1.0.0/ascii.yaml b/reference_files/1.0.0/ascii.yaml
index 1f68f9b9..f8a39abd 100644
--- a/reference_files/1.0.0/ascii.yaml
+++ b/reference_files/1.0.0/ascii.yaml
@@ -4,7 +4,7 @@
 %TAG ! tag:stsci.edu:asdf/
 --- !core/asdf-1.0.0
 asdf_library: !core/software-1.0.0 {author: The ASDF Developers, homepage: 'http://github.com/asdf-format/asdf',
-  name: asdf, version: 3.0.1}
+  name: asdf, version: 3.3.0}
 data: !core/ndarray-1.0.0
   data: ['', ascii]
   datatype: [ascii, 5]
diff --git a/reference_files/1.0.0/basic.asdf b/reference_files/1.0.0/basic.asdf
index 61fedf64..ed4ed696 100644
Binary files a/reference_files/1.0.0/basic.asdf and b/reference_files/1.0.0/basic.asdf differ
diff --git a/reference_files/1.0.0/basic.yaml b/reference_files/1.0.0/basic.yaml
index 4f715ada..14e0d352 100644
--- a/reference_files/1.0.0/basic.yaml
+++ b/reference_files/1.0.0/basic.yaml
@@ -4,7 +4,7 @@
 %TAG ! tag:stsci.edu:asdf/
 --- !core/asdf-1.0.0
 asdf_library: !core/software-1.0.0 {author: The ASDF Developers, homepage: 'http://github.com/asdf-format/asdf',
-  name: asdf, version: 3.0.1}
+  name: asdf, version: 3.3.0}
 data: !core/ndarray-1.0.0
   data: [0, 1, 2, 3, 4, 5, 6, 7]
   datatype: int64
diff --git a/reference_files/1.0.0/complex.asdf b/reference_files/1.0.0/complex.asdf
index 460355b8..477e8a60 100644
Binary files a/reference_files/1.0.0/complex.asdf and b/reference_files/1.0.0/complex.asdf differ
diff --git a/reference_files/1.0.0/complex.yaml b/reference_files/1.0.0/complex.yaml
index d43b26ef..d853f5f8 100644
--- a/reference_files/1.0.0/complex.yaml
+++ b/reference_files/1.0.0/complex.yaml
@@ -4,7 +4,7 @@
 %TAG ! tag:stsci.edu:asdf/
 --- !core/asdf-1.0.0
 asdf_library: !core/software-1.0.0 {author: The ASDF Developers, homepage: 'http://github.com/asdf-format/asdf',
-  name: asdf, version: 3.0.1}
+  name: asdf, version: 3.3.0}
 datatype<c16: !core/ndarray-1.0.0
   data: [!core/complex-1.0.0 0j, !core/complex-1.0.0 0j, !core/complex-1.0.0 (nan+nanj),
     !core/complex-1.0.0 (nan+infj), !core/complex-1.0.0 (nan-infj), !core/complex-1.0.0 -1.7976931348623157e+308j,
diff --git a/reference_files/1.0.0/compressed.asdf b/reference_files/1.0.0/compressed.asdf
index 9b072e98..be7b4fde 100644
Binary files a/reference_files/1.0.0/compressed.asdf and b/reference_files/1.0.0/compressed.asdf differ
diff --git a/reference_files/1.0.0/compressed.yaml b/reference_files/1.0.0/compressed.yaml
index 7f0557cf..327095b9 100644
--- a/reference_files/1.0.0/compressed.yaml
+++ b/reference_files/1.0.0/compressed.yaml
@@ -4,7 +4,7 @@
 %TAG ! tag:stsci.edu:asdf/
 --- !core/asdf-1.0.0
 asdf_library: !core/software-1.0.0 {author: The ASDF Developers, homepage: 'http://github.com/asdf-format/asdf',
-  name: asdf, version: 3.0.1}
+  name: asdf, version: 3.3.0}
 bzp2: !core/ndarray-1.0.0
   data: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20,
     21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
diff --git a/reference_files/1.0.0/endian.asdf b/reference_files/1.0.0/endian.asdf
new file mode 100644
index 00000000..ae247fa0
Binary files /dev/null and b/reference_files/1.0.0/endian.asdf differ
diff --git a/reference_files/1.0.0/endian.yaml b/reference_files/1.0.0/endian.yaml
new file mode 100644
index 00000000..13d142bc
--- /dev/null
+++ b/reference_files/1.0.0/endian.yaml
@@ -0,0 +1,20 @@
+#ASDF 1.0.0
+#ASDF_STANDARD 1.0.0
+%YAML 1.1
+%TAG ! tag:stsci.edu:asdf/
+--- !core/asdf-1.0.0
+asdf_library: !core/software-1.0.0 {author: The ASDF Developers, homepage: 'http://github.com/asdf-format/asdf',
+  name: asdf, version: 3.3.0}
+big: !core/ndarray-1.0.0
+  data: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20,
+    21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
+    41]
+  datatype: int32
+  shape: [42]
+little: !core/ndarray-1.0.0
+  data: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20,
+    21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
+    41]
+  datatype: int32
+  shape: [42]
+...
diff --git a/reference_files/1.0.0/exploded.asdf b/reference_files/1.0.0/exploded.asdf
index 3262eb1a..9103a8b1 100644
--- a/reference_files/1.0.0/exploded.asdf
+++ b/reference_files/1.0.0/exploded.asdf
@@ -4,7 +4,7 @@
 %TAG ! tag:stsci.edu:asdf/
 --- !core/asdf-1.0.0
 asdf_library: !core/software-1.0.0 {author: The ASDF Developers, homepage: 'http://github.com/asdf-format/asdf',
-  name: asdf, version: 3.0.1}
+  name: asdf, version: 3.3.0}
 data: !core/ndarray-1.0.0
   source: exploded0000.asdf
   datatype: int64
diff --git a/reference_files/1.0.0/exploded.yaml b/reference_files/1.0.0/exploded.yaml
index 4f715ada..14e0d352 100644
--- a/reference_files/1.0.0/exploded.yaml
+++ b/reference_files/1.0.0/exploded.yaml
@@ -4,7 +4,7 @@
 %TAG ! tag:stsci.edu:asdf/
 --- !core/asdf-1.0.0
 asdf_library: !core/software-1.0.0 {author: The ASDF Developers, homepage: 'http://github.com/asdf-format/asdf',
-  name: asdf, version: 3.0.1}
+  name: asdf, version: 3.3.0}
 data: !core/ndarray-1.0.0
   data: [0, 1, 2, 3, 4, 5, 6, 7]
   datatype: int64
diff --git a/reference_files/1.0.0/exploded0000.asdf b/reference_files/1.0.0/exploded0000.asdf
index 08f1718d..192742c9 100644
Binary files a/reference_files/1.0.0/exploded0000.asdf and b/reference_files/1.0.0/exploded0000.asdf differ
diff --git a/reference_files/1.0.0/float.asdf b/reference_files/1.0.0/float.asdf
index d35ab5bc..e92034ee 100644
Binary files a/reference_files/1.0.0/float.asdf and b/reference_files/1.0.0/float.asdf differ
diff --git a/reference_files/1.0.0/float.yaml b/reference_files/1.0.0/float.yaml
index 3c95fbc8..edddb1af 100644
--- a/reference_files/1.0.0/float.yaml
+++ b/reference_files/1.0.0/float.yaml
@@ -4,7 +4,7 @@
 %TAG ! tag:stsci.edu:asdf/
 --- !core/asdf-1.0.0
 asdf_library: !core/software-1.0.0 {author: The ASDF Developers, homepage: 'http://github.com/asdf-format/asdf',
-  name: asdf, version: 3.0.1}
+  name: asdf, version: 3.3.0}
 datatype<f4: !core/ndarray-1.0.0
   data: [0.0, -0.0, .nan, .inf, -.inf, -3.4028234663852886e+38, 3.4028234663852886e+38,
     1.1920928955078125e-07, 5.960464477539063e-08, 1.1754943508222875e-38]
diff --git a/reference_files/1.0.0/int.asdf b/reference_files/1.0.0/int.asdf
index 53134605..b8688e37 100644
Binary files a/reference_files/1.0.0/int.asdf and b/reference_files/1.0.0/int.asdf differ
diff --git a/reference_files/1.0.0/int.yaml b/reference_files/1.0.0/int.yaml
index b5d69cb8..42525dec 100644
--- a/reference_files/1.0.0/int.yaml
+++ b/reference_files/1.0.0/int.yaml
@@ -4,7 +4,7 @@
 %TAG ! tag:stsci.edu:asdf/
 --- !core/asdf-1.0.0
 asdf_library: !core/software-1.0.0 {author: The ASDF Developers, homepage: 'http://github.com/asdf-format/asdf',
-  name: asdf, version: 3.0.1}
+  name: asdf, version: 3.3.0}
 datatype<i1: !core/ndarray-1.0.0
   data: [127, -128, 0]
   datatype: int8
diff --git a/reference_files/1.0.0/scalars.asdf b/reference_files/1.0.0/scalars.asdf
new file mode 100644
index 00000000..ef60c4ef
--- /dev/null
+++ b/reference_files/1.0.0/scalars.asdf
@@ -0,0 +1,11 @@
+#ASDF 1.0.0
+#ASDF_STANDARD 1.0.0
+%YAML 1.1
+%TAG ! tag:stsci.edu:asdf/
+--- !core/asdf-1.0.0
+asdf_library: !core/software-1.0.0 {author: The ASDF Developers, homepage: 'http://github.com/asdf-format/asdf',
+  name: asdf, version: 3.3.0}
+float: 3.14
+int: 42
+string: foo
+...
diff --git a/reference_files/1.0.0/scalars.yaml b/reference_files/1.0.0/scalars.yaml
new file mode 100644
index 00000000..ef60c4ef
--- /dev/null
+++ b/reference_files/1.0.0/scalars.yaml
@@ -0,0 +1,11 @@
+#ASDF 1.0.0
+#ASDF_STANDARD 1.0.0
+%YAML 1.1
+%TAG ! tag:stsci.edu:asdf/
+--- !core/asdf-1.0.0
+asdf_library: !core/software-1.0.0 {author: The ASDF Developers, homepage: 'http://github.com/asdf-format/asdf',
+  name: asdf, version: 3.3.0}
+float: 3.14
+int: 42
+string: foo
+...
diff --git a/reference_files/1.0.0/shared.asdf b/reference_files/1.0.0/shared.asdf
index e7908474..b817a20d 100644
Binary files a/reference_files/1.0.0/shared.asdf and b/reference_files/1.0.0/shared.asdf differ
diff --git a/reference_files/1.0.0/shared.yaml b/reference_files/1.0.0/shared.yaml
index 7f33ce2b..4b36e420 100644
--- a/reference_files/1.0.0/shared.yaml
+++ b/reference_files/1.0.0/shared.yaml
@@ -4,7 +4,7 @@
 %TAG ! tag:stsci.edu:asdf/
 --- !core/asdf-1.0.0
 asdf_library: !core/software-1.0.0 {author: The ASDF Developers, homepage: 'http://github.com/asdf-format/asdf',
-  name: asdf, version: 3.0.1}
+  name: asdf, version: 3.3.0}
 data: !core/ndarray-1.0.0
   data: [0, 1, 2, 3, 4, 5, 6, 7]
   datatype: int64
diff --git a/reference_files/1.0.0/stream.asdf b/reference_files/1.0.0/stream.asdf
index f6de58d4..e2938cea 100644
Binary files a/reference_files/1.0.0/stream.asdf and b/reference_files/1.0.0/stream.asdf differ
diff --git a/reference_files/1.0.0/stream.yaml b/reference_files/1.0.0/stream.yaml
index d7545809..45e7869e 100644
--- a/reference_files/1.0.0/stream.yaml
+++ b/reference_files/1.0.0/stream.yaml
@@ -4,7 +4,7 @@
 %TAG ! tag:stsci.edu:asdf/
 --- !core/asdf-1.0.0
 asdf_library: !core/software-1.0.0 {author: The ASDF Developers, homepage: 'http://github.com/asdf-format/asdf',
-  name: asdf, version: 3.0.1}
+  name: asdf, version: 3.3.0}
 my_stream: !core/ndarray-1.0.0
   data:
   - [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
diff --git a/reference_files/1.0.0/structured.asdf b/reference_files/1.0.0/structured.asdf
new file mode 100644
index 00000000..a1693676
Binary files /dev/null and b/reference_files/1.0.0/structured.asdf differ
diff --git a/reference_files/1.0.0/structured.yaml b/reference_files/1.0.0/structured.yaml
new file mode 100644
index 00000000..6301b41d
--- /dev/null
+++ b/reference_files/1.0.0/structured.yaml
@@ -0,0 +1,18 @@
+#ASDF 1.0.0
+#ASDF_STANDARD 1.0.0
+%YAML 1.1
+%TAG ! tag:stsci.edu:asdf/
+--- !core/asdf-1.0.0
+asdf_library: !core/software-1.0.0 {author: The ASDF Developers, homepage: 'http://github.com/asdf-format/asdf',
+  name: asdf, version: 3.3.0}
+structured: !core/ndarray-1.0.0
+  data:
+  - [1, a, 3.299999952316284]
+  - [2, b, 6.599999904632568]
+  datatype:
+  - {datatype: uint8, name: a}
+  - datatype: [ascii, 3]
+    name: b
+  - {datatype: float32, name: c}
+  shape: [2]
+...
diff --git a/reference_files/1.0.0/unicode_bmp.asdf b/reference_files/1.0.0/unicode_bmp.asdf
index 270c477b..91eb1cef 100644
Binary files a/reference_files/1.0.0/unicode_bmp.asdf and b/reference_files/1.0.0/unicode_bmp.asdf differ
diff --git a/reference_files/1.0.0/unicode_bmp.yaml b/reference_files/1.0.0/unicode_bmp.yaml
index 269edd2c..c905ed2a 100644
--- a/reference_files/1.0.0/unicode_bmp.yaml
+++ b/reference_files/1.0.0/unicode_bmp.yaml
@@ -4,7 +4,7 @@
 %TAG ! tag:stsci.edu:asdf/
 --- !core/asdf-1.0.0
 asdf_library: !core/software-1.0.0 {author: The ASDF Developers, homepage: 'http://github.com/asdf-format/asdf',
-  name: asdf, version: 3.0.1}
+  name: asdf, version: 3.3.0}
 datatype<U: !core/ndarray-1.0.0
   data: ['', Æʩ]
   datatype: [ucs4, 2]
diff --git a/reference_files/1.0.0/unicode_spp.asdf b/reference_files/1.0.0/unicode_spp.asdf
index 69c31460..c1bf8937 100644
Binary files a/reference_files/1.0.0/unicode_spp.asdf and b/reference_files/1.0.0/unicode_spp.asdf differ
diff --git a/reference_files/1.0.0/unicode_spp.yaml b/reference_files/1.0.0/unicode_spp.yaml
index 40945049..c687a786 100644
--- a/reference_files/1.0.0/unicode_spp.yaml
+++ b/reference_files/1.0.0/unicode_spp.yaml
@@ -4,7 +4,7 @@
 %TAG ! tag:stsci.edu:asdf/
 --- !core/asdf-1.0.0
 asdf_library: !core/software-1.0.0 {author: The ASDF Developers, homepage: 'http://github.com/asdf-format/asdf',
-  name: asdf, version: 3.0.1}
+  name: asdf, version: 3.3.0}
 datatype<U: !core/ndarray-1.0.0
   data: ['', "\U00010020"]
   datatype: [ucs4, 1]
diff --git a/reference_files/generate/generate.py b/reference_files/generate/generate.py
index f55249a7..ef5759d9 100644
--- a/reference_files/generate/generate.py
+++ b/reference_files/generate/generate.py
@@ -9,6 +9,47 @@
 import numpy as np
 
 
+def ref_scalars(fd):
+    tree = {
+        'int': 42,
+        'float': 3.14,
+        'string': 'foo',
+    }
+    asdf.AsdfFile(tree).write_to(fd)
+
+
+def ref_anchor(fd):
+    nestee = {"abc": 123}
+    tree = {
+        "a": nestee,
+        "b": nestee,
+    }
+    asdf.AsdfFile(tree).write_to(fd)
+
+
+def ref_endian(fd):
+    tree = {
+        'big': np.arange(42, dtype=">i4"),
+        'little': np.arange(42, dtype="<i4"),
+    }
+
+    asdf.AsdfFile(tree).write_to(fd)
+
+
+def ref_structured(fd):
+    tree = {
+        'structured': np.array(
+            [
+                (1, 'a', 3.3),
+                (2, 'b', 6.6),
+            ], dtype=[
+                ('a', np.uint8),
+                ('b', 'S3'),
+                ('c', np.float32),
+            ]),
+    }
+    asdf.AsdfFile(tree).write_to(fd)
+
 def ref_basic(fd):
     tree = {
         'data': np.arange(8)