XPath in Oraclize RSS query

Question

I am trying to get my hands on Oraclize, testing some sample queries with their Test query service. I can't get XML parser working with XPath. The documentation lacks an XML example.

Consider this simple feed.

The following query returns Dictionary.com Word of the Day, as expected:

xml(http://www.dictionary.com/wordoftheday/wotd.rss).rss.channel.title

The following semantically equivalent query that uses XPath returns nothing:

xml(http://www.dictionary.com/wordoftheday/wotd.rss).xpath(./rss/channel/title/text())

How can I query an RSS feed with Oraclize and filter the results according to come criteria (e.g., items with <user> field equal to Alice, etc)?

Answer 1

This is working - specify absolute rather than relative path in the XPath:

xml(http://www.dictionary.com/wordoftheday/wotd.rss).xpath(/rss/channel/title/text())