评估plist iphone sdk中的元素

ok i have a plist like this

我有一个这样的列表

`
<dict>
<key>Rows</key>
<array>
    <dict>
        <key>WireSize</key>
        <string>16 AWG</string>
        <key>Children</key>
        <array>
            <dict>
                <key>Cooper 60°C (140°F)</key>
                <string>0</string>
            </dict>
            <dict>
                <key>Cooper 75°C (167°F)</key>
                <string>0</string>
            </dict>
            <dict>
                <key>Cooper 90°C (194°F)</key>
                <string>14</string>
            </dict>
            <dict>
                <key>Aluminum 60°C (140°F)</key>
                <string>0</string>
            </dict>
            <dict>
                <key>Aluminum 75°C (167°F)</key>
                <string>0</string>
            </dict>
            <dict>
                <key>Aluminum 90°C (194°F)</key>
                <string>0</string>
            </dict>
        </array>
    </dict>
    <dict>
        <key>WireSize</key>
        <string>16 AWG</string>
        <key>Children</key>
        <array>
            <dict>
                <key>Cooper 60°C (140°F)</key>
                <string>0</string>
            </dict>
            <dict>
                <key>Cooper 75°C (167°F)</key>
                <string>0</string>
            </dict>
            <dict>
                <key>Cooper 90°C (194°F)</key>
                <string>14</string>
            </dict>
            <dict>
                <key>Aluminum 60°C (140°F)</key>
                <string>0</string>
            </dict>
            <dict>
                <key>Aluminum 75°C (167°F)</key>
                <string>0</string>
            </dict>
            <dict>
                <key>Aluminum 90°C (194°F)</key>
                <string>0</string>
            </dict>
        </array>
    </dict>

</array>
`
<di