golang xml 递归嵌套解析

<group>
    <name>pub</name>
    <group>
        <name>base</name>
        <group>
            <name>test</name>
            <file>
                <name>$PROJ_DIR$\..\daq\src\main.cpp</name>
            </file>
        </group>
        <file>
            <name>$PROJ_DIR$\..\pub\base\crc32.c</name>
        </file>
    </group>
</group>

//可嵌套的
type GroupItem struct {
	Name  string      `xml:"name"`
	File  []FileName  `xml:"file"`
	Group []GroupItem `xml:"group"`
}

type FileName struct {
	Name string `xml:"name"`
}