Pathik wrote:

> I have to get the values of "reading" and "value" elements of context
> Person/Category/Group/ser.These values must be on condition
> based,means I have to get the values of "reading" and "value" if
> entity="abc" and value="1" , and entity= "def" and value="2" at the
> Person/Category/Group/series/Key.
> 
> My xml source file is as follows.
> 
> <?xml version="1.0" encoding="UTF-8"?>
> <Person>
>      <Category>
>          <Group>
>              <series>
>                  <Key>
>                      <Main entity="abc" value="1"></Main>
>                      <Main entity="def" value="2"></Main>
>                  </Key>
>              </series>
>              <ser>
>                  <reading>age</reading>
>                  <value>100</value>
>              </ser>
>              <ser>
>                  <reading>height</reading>
>                  <value>6</value>
>              </ser>
>              <ser>
>                  <reading>weight</reading>
>                  <value>80</value>
>              </ser>
>          </Group>
>        </Category>
>   </Person>

It is not clear to me which ser/reading and ser/value element you are 
looking for as I don't see the relationship between the series/Key/Main 
elements and those ser elements. Are you looking for all reading and 
value elements if the document contains the Main elements meeting your 
conditions on the attributes?

> I am new to xml. I don't know how to write xpath for such a thing.

You need to learn about predicates which can be put into square brackets 
e.g.
   /Person/Category/Group
selects all Group elements with that path, then you can add a predicate 
to filter them in square brackets e.g.
   /Person/Category/Group[series/Key[Main[@entity = 'abc' and @value = 
'1'] and Main[@entity = 'def' and @value = '2']]]
filters based on series/Key descendants for which another condition 
holds, there is a Main child meeting your first attribute condition and 
there is a Main child meeting the second attribute condition.
Then if you are looking for ser/reading desdendant elements of that 
Group element you can add
   /Person/Category/Group[series/Key[Main[@entity = 'abc' and @value = 
'1'] and Main[@entity = 'def' and @value = '2']]]/ser/reading



-- 

	Martin Honnen
	http://JavaScript.FAQTs.com/