Re: [xsl] traversing the tree from an arbitrary node

[Jeni Tennison <mail at jenitennison dot com>]

Hi Chris,

> I am using XT on a Windows NT platform. When I run this line, I get
> the error message of "expected node test":
>
>        <xsl:when test="id('$id')/from-ancestors(*[position()
> =$elementDepth][self::rootTag])">
>
> $id contains the ID of the tag I want, and $elementDepth contains
> the number of steps down from the <rootTag> I expect to be. What I
> am trying to say for that node test is "from the node that has this
> id, go up $elementDepth ancestor nodes and see if that node is
> <rootTag>." What am I doing wrong?

You're basically there except that you need the ancestor axis rather
than this from-ancestor() function. Also, I think you want to pass the
id() function the value of the variable $id rather than the string
'$id'. So the path you need is:

  id($id)/ancestor::*[position() = $elementDepth][self::rootTag]

or (because numbers in predicates are tested against the position of
the node in the node list):

  id($id)/ancestor::*[number($elementDepth)][self::rootTag]

I hope that helps,

Jeni

---
Jeni Tennison
http://www.jenitennison.com/


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