<target name="war.import" depends="svn.task,war.name">
    <echo>A: ${war.name}</echo>
  </target>

有时用

        <target name="war.name">

                <echo>
                        task war.name need to pass 4 parameters:
                        project.name
                        release.version
                        deploy.type
                </echo>

                <property name="war.name" value="${project.name}-${release.version}_${deploy.type}-${today}-${build.number}.war"/>
                <property name="war.file" value="${bin.dir}/${war.name}"/>

                <property name="war.md5.name" value="${war.name}.MD5"/>
                <property name="war.md5.file" value="${bin.dir}/${war.md5.name}"/>

                <echo>
                |-------------------------------------------------------------------------------|
                war.name        : ${war.name}
                war.file        : ${war.file}
                war.md5.name    : ${war.md5.name}
                war.md5.file    : ${war.md5.file}
                |-------------------------------------------------------------------------------|
                </echo>

        </target>

那么第一种调用方法，就能正确取得war.name属性的值，而第二种调用就不能。所以建议尽可能的使用depends进行任务调用。

区别在细微的地方，不过也值得注意。