Fixed: Project did not build anymore due to changes in directory layout introduced in commit 52f997f, which conflicted with PR #20

src/main/java/org/mustangproject/ZUGFeRD/PDFAConformanceLevel.java

@@ -0,0 +1,24 @@
+package org.mustangproject.ZUGFeRD;
+
+public enum PDFAConformanceLevel {
+    ACCESSIBLE("A"), BASIC("B"), UNICODE("U");
+
+    private final String letter;
+
+    PDFAConformanceLevel(String letter) {
+        this.letter = letter;
+    }
+
+    public String getLetter() {
+        return letter;
+    }
+
+    public static PDFAConformanceLevel findByLetter(String letter) {
+        for (PDFAConformanceLevel candidate : values()) {
+            if (candidate.letter.equals(letter)) {
+                return candidate;
+            }
+        }
+        throw new IllegalArgumentException("PDF conformance level <" + letter + "> is unknown.");
+    }
+}

src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDConformanceLevel.java

@@ -0,0 +1,5 @@
+package org.mustangproject.ZUGFeRD;
+
+public enum ZUGFeRDConformanceLevel {
+    BASIC, COMFORT, EXTENDED;
+}