modified intro to accommodate new order and added features

git-svn-id: https://src.springframework.org/svn/spring-framework/trunk@1771 50f2f4bb-b051-0410-bef5-90022cba6387

spring-framework-reference/src/scheduling.xml

@@ -3,22 +3,29 @@
  "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
 
 <chapter id="scheduling">
-    <title>Scheduling and Thread Pooling</title>
+    <title>Asynchronous Execution, Scheduling, and Thread Pooling</title>
 	<section id="scheduling-introduction">
 		<title>Introduction</title>
 		<para>
-		The Spring Framework features integration classes for scheduling support. Currently, Spring
-		supports the <classname>Timer</classname>, part of the JDK since 1.3, and the
-		Quartz Scheduler (<ulink url="http://www.opensymphony.com/quartz/"/>). Both schedulers
+		The Spring Framework provides abstractions for asynchronous execution and scheduling of tasks
+		with the <interfacename>TaskExecutor</interfacename> and <interfacename>TaskScheduler</interfacename>
+		interfaces, respectively. Spring also features implementations of those interfaces that support
+		thread pools or delegation to CommonJ within an application server environment. Ultimately
+		the use of these implementations behind the common interfaces abstracts away the differences
+		between Java SE 5, Java SE 6 and Java EE environments.
+		</para>
+		<para>
+		Spring also features integration classes for supporting scheduling with the
+		<classname>Timer</classname>, part of the JDK since 1.3, and the Quartz Scheduler
+		(<ulink url="http://www.opensymphony.com/quartz/"/>). Both of those schedulers
 		are set up using a <interfacename>FactoryBean</interfacename> with optional references
 		to <classname>Timer</classname> or <classname>Trigger</classname> instances, respectively.
 		Furthermore, a convenience class for both the Quartz Scheduler and the <classname>Timer</classname> is
 		available that allows you to invoke a method of an existing target object
 		(analogous to the normal <classname>MethodInvokingFactoryBean</classname> operation).
-		Spring also features classes for thread pooling that abstract
-		away differences between Java SE 1.4, Java SE 5 and Java EE environments.
-  	</para>
+  		</para>
 	</section>
+
 	<section id="scheduling-task-executor">
 		<title>The Spring <interfacename>TaskExecutor</interfacename> abstraction</title>