r - XPath在R中的br标签之后提取文本

Question

如何提取br之后的文本以下几行中的标签:

<div id='population'>
    The Snow Leopard Survival Strategy (McCarthy <em>et al.</em> 2003, Table
    II) compiled national snow leopard population estimates, updating the work
    of Fox (1994). Many of the estimates are acknowledged to be rough and out
    of date, but the total estimated population is 4,080-6,590, as follows:<br>
    <br>
    Afghanistan: 100-200?<br>
    Bhutan: 100-200?<br>
    China: 2,000-2,500<br>
    India: 200-600<br>
    Kazakhstan: 180-200<br>
    Kyrgyzstan: 150-500<br>
    Mongolia: 500-1,000<br>
    Nepal: 300-500<br>
    Pakistan: 200-420<br>
    Russia: 150-200<br>
    Tajikistan: 180-220<br>
    Uzbekistan: 20-50
</div>

我得到了:

xpathSApply(h, '//div[@id="population"]', xmlValue)

但我现在卡住了...

Answer 1

如果您意识到文本也是一个节点，它会有所帮助。 div 中的所有文本都紧随其后 <br/>可以通过以下方式检索:

//div[@id="population"]/text()[preceding-sibling::br]

从技术上讲，在 <br/> 之间标签意味着:

//div[@id="population"]/text()[preceding-sibling::br and following-sibling::br]

......但我想这不是你现在想要的。