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diff --git a/src/org/cacert/gigi/output/template/IterableDataset.java b/src/org/cacert/gigi/output/template/IterableDataset.java
new file mode 100644
index 00000000..d908fccc
--- /dev/null
+++ b/src/org/cacert/gigi/output/template/IterableDataset.java
@@ -0,0 +1,19 @@
+package org.cacert.gigi.output.template;
+
+import java.util.Map;
+
+/**
+ * Represents some kind of data, that may be iterated over in a template.
+ */
+public interface IterableDataset {
+	/**
+	 * Moves to the next Dataset.
+	 * 
+	 * @param vars
+	 *            the variables used in this template. They need to be updated
+	 *            for each line.
+	 * @return true, iff there was a data-line "installed". False of this set is
+	 *         already empty.
+	 */
+	public boolean next(Map<String, Object> vars);
+}