从xml里面取想要的数据:

xmllint --xpath 'string($xmlPath)' k.xml

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#common usage:
xmllint --xpath '//element/@attribute' filename.xml
xmlstarlet sel -T -t -m '//element/@attribute' -v '.' -n filename.xml

# xmllint shell usage:
http:// lizards.opensuse.org/2009/11/23/playing-with-xpath-expressions-in-the-xmllint-shell

# difference of "//div[@class='known']" and "string(//div[@class='known']/@name)"
http:// stackoverflow.com/tags/xmllint/hot