added some javadoc

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

@@ -34,6 +34,8 @@ public class XMPSchemaZugferd extends XMPSchema {
 	/***
 	 * This is what needs to be added to the RDF metadata - basically the name of the embedded Zugferd file
 	 * @param metadata the xmp to be added to
+	 * @param zfVersion which ZF version to use (2 for FX)
+	 * @param isFacturX whether to export as Factur-X
 	 * @param conformanceLevel e.g.  conformanceLevel.EN16931
 	 * @param URN the xml URI for the XMP
 	 * @param prefix the xml namespace prefix for the XMP, zf for ZUGFeRD, fx for Factur-X

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

@@ -132,8 +132,8 @@ public class ZUGFeRDExporter implements Closeable {
 
 	/**
 	 * Adds additional file attachments into the ZF
-	 * @param filename
-	 * @param filecontent
+	 * @param filename the name of the attachment
+	 * @param filecontent the bytearray with the file contents
 	 */
 	public void addAdditionalFile(String filename, byte[] filecontent) {
 		additionalFiles.put(filename, filecontent);