example for repeated execution added

src/main/java/org/aktin/exchange/QuerySchedule.java

@@ -14,8 +14,8 @@ import javax.xml.bind.annotation.XmlSeeAlso;
 public abstract class QuerySchedule {
 
 	/**
-	 * Duration for the query. The duration is relative
-	 * to a reference timestamp and might also be negative.
+	 * Duration for the queried data, relative to the request reference date
+	 * {@link QueryRequest#referenceDate}. Usually negative: e.g. -D1M for previous month.
 	 */
 	@XmlElement(required=true)
 	public Period duration;

src/main/java/org/aktin/exchange/RepeatedExecution.java

@@ -18,5 +18,5 @@ public class RepeatedExecution extends QuerySchedule{
 	 * This property will not cause any execution on the data warehouse side.
 	 * It is solely for information purposes.
 	 */
-	public Duration repeats;
+	public Duration interval;
 }

src/test/java/org/aktin/exchange/TestUnmarshallDocuments.java

@@ -72,7 +72,7 @@ public class TestUnmarshallDocuments {
 	public void unmarshallQuery() throws IOException, SAXException{
 		Source xml = getResource("/query.xml");
 		Query query = JAXB.unmarshal(xml, Query.class);
-		Assert.assertEquals(query.schedule.getClass(), SingleExecution.class);
+		Assert.assertEquals(SingleExecution.class, query.schedule.getClass());
 		SingleExecution se = (SingleExecution)query.schedule;
 		Assert.assertNotNull(se.duration);
 		Assert.assertNotNull(se.reference);

src/test/resources/query-repeating.xml

+<query xmlns="http://aktin.org/ns/exchange"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xmlns:dwh="http://aktin.org/ns/dwh"
+	xmlns:psm="http://www.i2b2.org/xsd/cell/crc/psm/1.1/">
+	<id>123</id>
+	<description>Lala</description>
+	<principal>
+		<name>Prince Ipal</name>
+		<organisation>AKTIN</organisation>
+		<email>it-support@aktin.org</email>
+		<phone>+49 (441) 798 - 2772</phone>
+	</principal>
+	<schedule xsi:type="repeatedExecution">
+		<duration>-1W</duration>
+		<interval>P1D</interval>
+	</schedule>
+	<concepts>
+		<concept id="birthdate" xsi:type="raw"/>
+	</concepts>
+	<!-- also possible: xsi:type="psm:query_definition" -->
+	<!-- also possible: xsi:type="dwh:eclectic_query", 
+	see http://methods.schattauer.de/en/contents/archivestandard/issue/2168/manuscript/21349/show.html
+		-->
+	<dwh:sql xsi:type="dwh:sqlt">
+		SELECT a, b;
+	</dwh:sql>
+</query>

src/test/resources/query.xml

 <query xmlns="http://aktin.org/ns/exchange"
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xmlns:dwh="http://aktin.org/ns/dwh">
+	xmlns:dwh="http://aktin.org/ns/dwh"
+	xmlns:psm="http://www.i2b2.org/xsd/cell/crc/psm/1.1/">
 	<id>123</id>
 	<description>Lala</description>
 	<principal>
@@ -16,6 +17,10 @@
 	<concepts>
 		<concept id="birthdate" xsi:type="raw"/>
 	</concepts>
+	<!-- also possible: xsi:type="psm:query_definition" -->
+	<!-- also possible: xsi:type="dwh:eclectic_query", 
+	see http://methods.schattauer.de/en/contents/archivestandard/issue/2168/manuscript/21349/show.html
+		-->
 	<dwh:sql xsi:type="dwh:sqlt">
 		SELECT a, b;
 	</dwh:sql>