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我正在個人項目和使用Rails學習框架。該項目是基於音樂的,我使用ChartLyrics.com的API來檢索歌詞。 API返回XML,我無法從XML中提取實際的歌詞元素。我需要幫助從XML中提取值在ruby/rails
我已經安裝了Nokogiri gem來幫助解析XML。以下是我用來檢索數據的內容。從軌道控制檯:
doc = Nokogiri::XML(open(http://api.chartlyrics.com/apiv1.asmx/SearchLyricDirect?artist=michael%20jackson&song=bad))
puts doc
<?xml version="1.0" encoding="utf-8"?>
<GetLyricResult xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://api.chartlyrics.com/">
<TrackId>0</TrackId>
<LyricChecksum>a4a56a99ee00cd8e67872a7764d6f9c6</LyricChecksum>
<LyricId>1710</LyricId>
<LyricSong>Bad</LyricSong>
<LyricArtist>Michael Jackson</LyricArtist>
<LyricUrl>http://www.chartlyrics.com/28h-8gWvNk-Rbj1X-R7PXg/Bad.aspx</LyricUrl>
<LyricCovertArtUrl>http://ec1.images-amazon.com/images/P/B000CNET66.02.MZZZZZZZ.jpg</LyricCovertArtUrl>
<LyricRank>9</LyricRank>
<LyricCorrectUrl>http://www.chartlyrics.com/app/correct.aspx?lid=MQA3ADEAMAA=</LyricCorrectUrl>
<Lyric>
Because I'm bad (bad-bad), I'm bad, come on (really, really bad)
You know I'm bad (bad-bad), I'm bad, you know it (really, really bad)
You know I'm bad (bad-bad), I'm bad, you know it (really, really bad) you know
And the whole world has to answer right now
Just to tell you once again
</Lyric>
</GetLyricResult>
我縮短了歌詞,以節省空間。我如何提取'抒情'元素?我試過以下所有內容:
> lyrics = doc.xpath('//Lyric')
=> []
> lyrics = doc.xpath('/Lyric')
=> []
> lyrics = doc.xpath('//GetLyricResult/Lyric')
=> []
> lyrics = doc.xpath('//GetLyricResult//Lyric')
=> []
> lyrics = doc.xpath('/GetLyricResult/Lyric')
=> []
'歌詞'每次都是零。誰能告訴我我做錯了什麼?由於
工作!非常感謝shioyama! PHP對命名空間並不着迷。應該知道。 – ericwindham
命名空間在處理複雜的XML時是非常必要的。對於普通的XML來說,它們是巨大的矯枉過正,並且讓人們不知所措。 Nokogiri使用CSS來繞過命名空間問題是一個不錯的結冰層,也是爲什麼我更喜歡在解析時使用CSS over XPath的原因之一。 –