Ant macrodef：有没有办法获取元素参数的内容？

我正在尝试调试Ant中的宏定义。我似乎找不到一种方法来显示作为元素发送的参数的内容

<project name='debug.macrodef'>
  <macrodef name='def.to.debug'>
    <attribute name='attr' />
    <element name='elem' />
    <sequential>
      <echo>Sure, the attribute is easy to debug: @{attr}</echo>
      <echo>The element works only in restricted cases: <elem /> </echo>
      <!-- This works only if <elem /> doesn't contain anything but a
           textnode, if there were any elements in there echo would
           complain it doesn't understand them. -->
    </sequential>
  </macrodef>

  <target name='works'>
    <def.to.debug attr='contents of attribute'>
      <elem>contents of elem</elem>
    </def.to.debug>
  </target>

  <target name='does.not.work'>
    <def.to.debug attr='contents of attribute'>
      <elem><sub.elem>contents of sub.elem</sub.elem></elem>
    </def.to.debug>
  </target>
</project>

因此，我想我需要一种方法将

的内容以某种方式放入属性中（某些扩展的macrodef实现可能会有这种方法），或者我需要一种

可以打印出放入其中的任何XML树。有人知道这两种方法的实现吗？当然，任何第三种非预期的获取数据的方法都是受欢迎的。

任务如何

在您的示例中，生成文件替换了行

<echo>The element works only in restricted cases: <elem /> </echo>

给予

$ant不起作用
...
不工作：
[echo]当然，属性很容易调试：属性的内容
[echo]子元素的内容

元素正是我想要的，谢谢！作为奖励，“”甚至可以在不进行额外处理的情况下添加XML头（在ant 1.8.4上测试）。

<echo>The element works only in restricted cases: <elem /> </echo>

<echoxml><elem /></echoxml>

$ ant does.not.work
...
does.not.work:
     [echo] Sure, the attribute is easy to debug: contents of attribute
<?xml version="1.0" encoding="UTF-8"?>
<sub.elem>contents of sub.elem</sub.elem>

<sequential>
  <echo>Sure, the attribute is easy to debug: @{attr}</echo>
  <echoxml file="macro_elem.xml"><elem /></echoxml>
  <loadfile property="elem" srcFile="macro_elem.xml">
    <filterchain>
      <LineContainsRegexp negate="yes">
      <regexp pattern=".xml version=.1.0. encoding=.UTF-8..." />
      </LineContainsRegexp>
    </filterchain>
  </loadfile>
  <echo message="${elem}" />
</sequential>

$ ant does.not.work
...
does.not.work:
     [echo] Sure, the attribute is easy to debug: contents of attribute
     [echo] <sub.elem>contents of sub.elem</sub.elem>