diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..e43b0f9
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.DS_Store
diff --git a/khmer/characters.yaml b/khmer/characters.yaml
new file mode 100644
index 0000000..eac23a4
--- /dev/null
+++ b/khmer/characters.yaml
@@ -0,0 +1,27 @@
+---
+
+- cp: 0x178A
+  id: "DA"
+  variant_by_type:
+    base:
+      written_units: [.da]
+    coeng:
+      written_units: [.coeng-da]
+
+- cp: 0x178F
+  id: "TA"
+  variant_by_type:
+    base:
+      written_units: [.ta]
+    coeng:
+      written_units: [.coeng-da]
+
+- cp: 0x17C4
+  id: "SIGN-OO"
+  variant_by_type:
+    cmap:
+      written_units: [.sign-e, .placeholder-base, .sign-aa]
+    decomposition:
+      written_units: [.sign-e, .sign-aa]
+
+...
diff --git a/khmer/graphical-units.yaml b/khmer/graphical-units.yaml
new file mode 100644
index 0000000..a3f5195
--- /dev/null
+++ b/khmer/graphical-units.yaml
@@ -0,0 +1,23 @@
+---
+
+- id: "da"
+  represented_phonetic_segments: [.DA]
+
+- id: "ta"
+  represented_phonetic_segments: [.TA]
+
+- id: "coeng-da"
+  represented_phonetic_segments: [.DA, .TA]
+
+{
+  graphic: .coeng-da,
+  phonetic: .ta,
+  context: …,
+}
+
+{
+  graphic: .coeng-da
+  phonetic: .da
+}
+
+...