Preventing ant tasks from replacing properties defined in source files

There seems to be a feature in XDoclet which replaces any properties
defined using ${myprop} syntax in Java source files with their value
when generating the XML.

More specifically, when running springdoclet, I want to use the
PropertyPlaceholderConfigurer class which requires me to have the
following in the XML file:

    <property name="dao">
      <ref bean="${personDAO}"/>
    </property>

but I am unable to produce this using XDoclet because I happen to have
a personDAO property in the ant build file.  The XDoclet tag in the
source file looks like:

    /**
     * @spring.property ref="${personDAO}"
     */

but this produces

    <property name="dao">
      <ref bean="com.blah.blah.PersonDAO"/>
    </property>

which is not what I want since the property has been substituted with
its value.  Is there a way of disabling property replacement for a
particular task?

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