xml - (//.) Expression in XPath -


i have little problem in getting xpath expression result !

let's have little xml file :

<bookstore>  <book>   <title lang="en">learning java</title>   <price>29.99</price>  </book>   <book>   <title lang="en">learning xpath</title>   <price>39.95</price>  </book> </bookstore>

what result of :

//book[//.='lear']

thank

what result of :

//book[//.='lear']

you can dump xml sample , xpath expression in xpath tester , see result (f.e using http://www.freeformatter.com/xpath-tester.html, or whatever like). above xpath , xml sample, result nothing. given particular xml input, above xpath expression same //book[false()]. predicate (content of []) evaluate false because there no element containing exact string "lear".

"but can tell me what's useful dot after double slash symbol ?"

to answer comment, see following break-down :

  • // : abbreviated syntax descendant-or-self axis.

  • . : reference current context node.

  • //. : can read find node anywhere in xml document. can expressed //self::node(). note // starts searching root element, doesn't care current book element being context.


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