OPEN - issue BATCH-1380: Make <flow/> a top-level element, so it can be shared or strategised in a job

Add <flow/> at top level and as element in a flow.

spring-batch-core/src/test/resources/org/springframework/batch/core/configuration/xml/FlowJobParserTests-context.xml

@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<beans:beans xmlns="http://www.springframework.org/schema/batch" xmlns:beans="http://www.springframework.org/schema/beans"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://www.springframework.org/schema/batch http://www.springframework.org/schema/batch/spring-batch-2.1.xsd
+	http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
+
+	<beans:import resource="common-context.xml" />
+
+	<job id="job1">
+		<step id="s1" parent="step1" next="job1.flow"/>
+		<flow id="job1.flow" ref="flow" next="s4" />
+		<step id="s4" parent="step4" />
+	</job>
+
+	<job id="job2">
+		<flow id="job2.flow" ref="flow">
+			 <next on="*" to="job2.s1"/> 
+			 <next on="FAILED" to="job2.s2"/> 
+		</flow>
+		<step id="job2.s1" parent="step1" />
+		<step id="job2.s2" parent="step2" />
+	</job>
+
+	<job id="job3">
+		<flow id="job3.flow" ref="flow" />
+	</job>
+
+	<job id="job4">
+		<split id="split">
+			<flow ref="flow" />
+			<flow ref="flow" />
+		</split>
+	</job>
+
+	<flow id="flow">
+		<step id="s2" parent="step2" next="s3"/>
+		<step id="s3" parent="step3" />
+	</flow>
+
+</beans:beans>