<span style="font-family: Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255);">轉：http://www.cnblogs.com/clarkchen/archive/2011/03/10/1980194.html</span>

Ant的概念 
Make命令是一個專案管理工具，而Ant所實現功能與此類似。像make，gnumake和nmake這些編譯工具都有一定的缺陷，但是Ant卻克服了這些工具的缺陷。最初Ant開發者在開發跨平臺的應用時，用樣也是基於這些缺陷對Ant做了更好的設計。 

Builder.xml例子，這個是Flex生成AsDoc的例子

<?xml version="1.0"?>

<!--

	ADOBE SYSTEMS INCORPORATED
	Copyright 2006-2009 Adobe Systems Incorporated
	All Rights Reserved.

	NOTICE: Adobe permits you to use, modify, and distribute this file
	in accordance with the terms of the license agreement accompanying it.

-->

<project name="ASDocs" default="main" basedir=".">
	<property file="build.properties" />
	<property name="lenient" value="true"/>
	<property name="flexlib" location="${FLEX_HOME}/frameworks"/>

	<target name="main" depends="clean,doc" description="Clean build of all ASDocs"/>

	<target name="clean" description="Cleans all ASDocs">
		<delete dir="${OUTPUT_DIR}"/>
		<echo>清除${OUTPUT_DIR}</echo>
	</target>

	<target name="doc">

	    <condition property="asdoc.jvm.args" value="-Xmx512m">
	        <os family="windows"/>
	    </condition>

	    <condition property="asdoc.jvm.args" value="-Xmx1024m">
	        <os family="mac"/>
	    </condition>

	    <condition property="asdoc.jvm.args" value="-Xmx512m">
	        <os family="unix"/>
	    </condition>

	    <available property="flexTasksJar" value="${FLEX_HOME}/lib/flexTasks.jar" file="${FLEX_HOME}/lib/flexTasks.jar"/>
	    <available property="flexTasksJar" value="${FLEX_HOME}/ant/lib/flexTasks.jar" file="${FLEX_HOME}/ant/lib/flexTasks.jar"/>

		<!-- Load the <asdoc> task. We can't do this at the <project> level -->
		<!-- because targets that run before flexTasks.jar gets built would fail. -->
		<taskdef resource="flexTasks.tasks" classpath="${flexTasksJar}"/>

		<!-- Call asdoc to generate dita xml files -->
		<asdoc output="${OUTPUT_DIR}" lenient="true" failonerror="true" warnings="false" strict="false" locale="en_US" fork="false">
			<!-- asDoc Infomation -->
			<window-title>asDocAPI標題</window-title>
			<main-title >asDocAPI文件</main-title>
			<footer>asDoc API 頁尾 版權所有XXXX</footer>
			
			<!-- top level class to include in asdoc -->
		    
			<!-- source path for asdoc -->
			<compiler.source-path path-element="src"/>
			<doc-sources path-element="src"/>
			<!-- namespaces to include in asdoc -->
			<!--<doc-namespaces uri="library://ns.myasdoc.com/flex/myasdoc"/>
			<namespace uri="library://ns.myasdoc.com/flex/myasdoc" manifest="my-manifest.xml"/>-->
			
		    <namespace uri="library://ns.adobe.com/flashx/textLayout" manifest="${flexlib}/projects/textLayout/manifest.xml"/>

			<!-- namespace declaration for asdoc -->
			
		    <namespace uri="http://www.adobe.com/2006/airmxml" manifest="${flexlib}/projects/airframework/manifest.xml"/>
		    <namespace uri="http://www.adobe.com/2006/airspark" manifest="${flexlib}/projects/airspark/manifest.xml"/>
		    <namespace uri="http://www.adobe.com/2006/rpcmxml" manifest="${flexlib}/projects/rpc/manifest.xml"/>
		    <namespace uri="http://ns.adobe.com/2009/mx-mxml" manifest="${flexlib}/projects/mx/manifest.xml"/>
		    <namespace uri="http://www.adobe.com/2006/advancedgridsmxml" manifest="${flexlib}/projects/advancedgrids/manifest_advancedgrids.xml"/>
		    <namespace uri="http://www.adobe.com/2006/charts" manifest="${flexlib}/projects/charts/manifest_charts.xml"/>
		    		    
		    <namespace uri="http://www.adobe.com/2006/mxml" manifest="${flexlib}/mxml-manifest.xml"/>
		    <namespace uri="library://ns.adobe.com/flex/spark" manifest="${flexlib}/projects/spark/manifest.xml"/>
		    <namespace uri="library://ns.adobe.com/flex/mx" manifest="${flexlib}/mxml-manifest.xml"/>
			<namespace uri="library://ns.adobe.com/flex/spark-mobilecomponents" manifest="${flexlib}/projects/mobilecomponents/manifest.xml"/>
			<namespace uri="library://ns.adobe.com/flex/spark-dmv" manifest="${flexlib}/projects/spark_dmv/manifest_spark_dmv.xml"/>

			<library-path dir="libs" includes="*.swc" append="true"/>
			<library-path dir="${FLEX_HOME}/frameworks/libs" includes="*.swc" append="true"/>
			<library-path dir="${FLEX_HOME}/frameworks/libs/mobile" includes="*.swc" append="true"/>
			<library-path dir="${FLEX_HOME}/frameworks/libs/automation" includes="*.swc" append="true"/>
			
			<external-library-path dir="${flexlib}/libs/air">
		    	<include name="airglobal.swc" />
		    </external-library-path>
			<external-library-path dir="${flexlib}/libs">
		    	<include name="framework.swc" />
		    </external-library-path>
			<external-library-path dir="${flexlib}/libs/air">
			   	<include name="airframework.swc" />
			</external-library-path>
			<external-library-path dir="${flexlib}/libs/air">
			   	<include name="airspark.swc" />
			</external-library-path>
			<jvmarg line="${asdoc.jvm.args}"/>
			<define name="CONFIG::debug" value="false"/>
			<define name="CONFIG::release" value="true"/>
			<define name="CONFIG::FLASH_10_1" value="false"/>
            <define name="CONFIG::LOGGING" value="false"/>
			<define name="CONFIG::performanceInstrumentation" value="false"/>            
		</asdoc>
	</target>
</project>