Re: [xsl] Selecting the first node set

[Abel Online <abel.online@xxxxxxxxx>]

Hi Fraser,

What you probably want is this (  * will return the first node with any 
name):
/Trade/*/Value/enum

Or, more specific, this (specifying that you only want the first unknown 
node):
/Trade/*[1]/Value/enum

Both return
/Trade[1]/UnknownName1[1]/Value[1]/enum[1] - A
/Trade[1]/UnknownName1[1]/Value[1]/enum[2] - B
/Trade[1]/UnknownName1[1]/Value[1]/enum[3] - C

If you only want the parent, you can, of course, do this (will return 
one node):
/Trade/*[1]/Value

>> /Trade//Value        - returns all 3 <Value> nodes
Correct, // means "descendant or self", does not matter how deep, it 
will return any Value node 'under or on' "Trade"

>> /Trade//Value[1]    - also returns all 3 <Value> nodes (why is that ?)
Correct, again "descendant or self". In this case, it is 'self' that is 
returned, because 'self' is the first node under 'UnknownNode' each time.

>> /Trade//Value[2]    - returns nothing (why is that ?)
There is no second node under 'UnknownNode'. If this were your input 
document, itreturn something:
<Trade>
   <UnknownName1>
       <Value>
           <enum>A</enum>
           <enum>B</enum>
       </Value>
       <Value>
           <enum>C</enum>
       </Value>
   </UnknownName1>
</Trade>

HtH,

Cheers,
Abel Braaksma
www.nuntia.nl



Fraser Goffin wrote:

> Given the following simplified XML instance, can anyone suggest an 
> expression that will return ONLY the 'Value' node containing <enum> 
> children with values A, B and C. I can't rely on the name of the 
> parent node of <Value> hence I have deliberately named these as 
> UnknownNameX or any other intervening structure.
>
> <Trade>
>     <UnknownName1>
>         <Value>
>             <enum>A</enum>
>             <enum>B</enum>
>             <enum>C</enum>
>         </Value>
>     </UnknownName1>
>     <UnknownName2>
>         <Value>/Trade//Value[ancestor::Trade]</Value>
>     </UnknownName2>
>     <Treatment>
>         <UnknownName3>
>             <Value>
>                 <enum>D</enum>
>                 <enum>E</enum>
>                 <enum>F</enum>
>             </Value>
>         </UnknownName3>
>     </Treatment>
> </Trade>
>
>
> /Trade//Value        - returns all 3 <Value> nodes
> /Trade//Value[1]    - also returns all 3 <Value> nodes (why is that ?)
> /Trade//Value[2]    - returns nothing (why is that ?)
>
> Cheers
>
> Fraser.