| Expressão | Descrição |
|---|---|
/ |
Dá o nó raiz |
// |
Dá todos os nós |
. |
Dá o nó atual |
.. |
Dá o nó pai |
@ |
Dá atributos |
[n] |
Dá o enésimo elemento |
[last()] |
Dá o último elemento |
[last()-n] |
Dá o enésimo elemento do último |
[position()<n] |
Dá os primeiros n elementos |
[x>n] |
Dá todos os elementos x contendo um elemento maior que n |
$x('/html')[<html>...</html>]$x('/html/body')[<body>...</body>]$x('/html/body/div')[<div>...</div>]$x('/html/body/div/h1')[<h1>Example Domain</h1>]$x('/html/body/div/p')[<p>...</p>,<p>...</p>]$x('/html/body/div/p[1]')[<p>...</p>]$x('/html/body/div/p[2]')[<p>...</p>]
$x('//html/head/title')[<title>Example Domain</title>]
$x('//p')[<p>...</p>,<p>...</p>]$x('//a')[<ahref="http://www.iana.org/domains/example">More information...</a>]
$x('//div//a')[<ahref="http://www.iana.org/domains/example">More information...</a>]$x('//div/a')[ ]
$x('//a/text()')[ "More information..." ]
$x('//div/*')[<h1>Example Domain</h1>,<p>...</p>,<p>...</p>]
$x('//a[@href]')[<ahref="http://www.iana.org/domains/example">More information...</a>]$x('//a[@href="http://www.iana.org/domains/example"]')[<ahref="http://www.iana.org/domains/example">More information...</a>]$x('//a[contains(@href, "iana")]')[<ahref="http://www.iana.org/domains/example">More information...</a>]$x('//a[starts-with(@href, "http://www.")]')[<ahref="http://www.iana.org/domains/example">More information...</a>]$x('//a[not(contains(@href, "abc"))]')[<ahref="http://www.iana.org/domains/example">More information...</a>]
response.xpath('/html').extract()[u'<html><head><title>...</body></html>']response.xpath('/html/body/div/h1').extract()[u'<h1>Example Domain</h1>']response.xpath('/html/body/div/p').extract()[u'<p>This domain ... permission.</p>', u'<p><ahref="http://www.iana.org/domains/example">More information...</a></p>']response.xpath('//html/head/title').extract()[u'<title>Example Domain</title>']response.xpath('//a').extract()[u'<ahref="http://www.iana.org/domains/example">More information...</a>']response.xpath('//a/@href').extract()[u'http://www.iana.org/domains/example']response.xpath('//a/text()').extract()[u'More information...']response.xpath('//a[starts-with(@href, "http://www.")]').extract()[u'<ahref="http://www.iana.org/domains/example">More information...</a>']
Obtendo expressôes XPath do Chrome
- Clicar com o botao direito no elemento –> inspecionar elemento
- clique com o botao direito no inspetor –> copy –> copy Xpath
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Last modified: 14 de setembro de 2019
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