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還有就是我的XML:xmlstarlet:無效的表達式:[XPath]中編譯錯誤:for-each元素*
<?xml version="1.0" encoding="UTF-8"?>
<CurrentUsage xmlns="http://www.vmware.com/vcloud/v1.5" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.vmware.com/vcloud/v1.5 http://cloud.com/api/v1.5/schema/master.xsd">
<Link rel="up" href="cloudurl" type="application/vnd.vmware.vcloud.vm+xml"/>
<Metric name="cpu.usage.average" unit="PERCENT" value="3.4"/>
<Metric name="cpu.usage.maximum" unit="PERCENT" value="3.4"/>
<Metric name="cpu.usagemhz.average" unit="MEGAHERTZ" value="81.0"/>
<Metric name="mem.usage.average" unit="PERCENT" value="15.99"/>
<Metric name="disk.provisioned.latest" unit="KILOBYTE" value="503337805"/>
<Metric name="disk.used.latest" unit="KILOBYTE" value="290391113"/>
</CurrentUsage>
我使用xmlstarlet工具,並能夠得到與值列表:
xmlstarlet sel -t -v //@value test.xml
但我真的堅持通過度量名稱獲得特定值(作爲「cpu.usage.average」的示例)。 我讀過噸的例子,試圖用這樣的表達式:
xmlstarlet sel -t -m "//[@name='cpu.usage.average']" -v //@value test.xml
但這滴我到:
Invalid expression: //[@name='cpu.usage.average'] compilation error: element for-each*
我如何在這種簡單的情況特殊的價值?