query on parent axis in xpath

[sid sree]

Hi my input xml

    
    <Hello><Bye>byeee</Bye>
</Hello>
   

My xpath expression

   
/child::Hello/parent::Bye
 

Also tried

   
/child::Hello/child::Bye/parent::Bye
 

My expected result Hello elemet.

Actual Result No elements

Where am i going wrong ?

[Paul Clapham]

So you started from your context node and looked for a child element whose name was Hello. Maybe you found that Hello element and maybe you didn't, depending on what your context node was. Then you looked for a parent of that node which was a Bye element. Presumably that Hello element isn't a child of any Bye element; it certainly isn't if that's your whole document.

[sid sree]

Thanks, I was reading the expression wrongly !

Yes that was my entire document

  
/child::Hello/child::Bye/parent::Hello 

This returns to me what i need.