1 files changed, 20 insertions, 0 deletions

diff --git a/src/main/java/org/uic/barcode/asn1/datatypes/Alphabet.java b/src/main/java/org/uic/barcode/asn1/datatypes/Alphabet.java
new file mode 100644
index 0000000..2b153ae
--- /dev/null
+++ b/src/main/java/org/uic/barcode/asn1/datatypes/Alphabet.java
@@ -0,0 +1,20 @@
+package org.uic.barcode.asn1.datatypes;
+
+/**
+ * Alphabet class for Restricted Strings.
+ *
+ * Use {@link AlphabetBuilder} for convenient construction of restriction alphabets.
+ */
+public abstract class Alphabet {
+
+    private final String chars;
+
+    protected Alphabet(String chars) {
+        this.chars = chars;
+    }
+
+    public final String chars() {
+        return chars;
+    }
+
+}