在YQL中使用xpath从网页获取锚文本

Question

SELECT content FROM html WHERE url="http://en.wikipedia.org/wiki/List_of_United_States_National_Parks_by_state" AND xpath="//a/text()"

不起作用，而

SELECT * FROM html WHERE url="http://en.wikipedia.org/wiki/List_of_United_States_National_Parks_by_state" AND xpath="//a/text()"

确实

SELECT content FROM html WHERE url="http://en.wikipedia.org/wiki/List_of_United_States_National_Parks_by_state" AND xpath="//a"

也有效，似乎YQL有错误，或者我错过了什么？

Answer 1

这是你在找什么？

SELECT content FROM html WHERE url="http://en.wikipedia.org/wiki/List_of_United_States_National_Parks_by_state" AND xpath="//a"

Answer 2

SELECT href
FROM html
WHERE url="http://en.wikipedia.org/wiki/List_of_United_States_National_Parks_by_state"
      AND xpath="//a"

在YQL console上尝试。