[xquery-talk] saxon:evaluate with relative xpath

[Hisham Benotman]

Thanks a lot. It works now.

On Sun, Dec 26, 2010 at 11:16 AM, Michael Kay <mike at saxonica.com> wrote:

>  saxon:evaluate evaluates the given XPath expression using the context node
> from the call to saxon:evaluate. So yes, the path can be relative. Just
> change "/author[1]" to "author[1]".
>
> Michael Kay
> Saxonica
>
>
> On 24/12/2010 05:33, Hisham Benotman wrote:
>
> Hi
>
>  Can I run dynamic RELATIVE xpath using saxon:evaluate? I retrieve book
> elements from books.xml file and I want to navigate these elements using
> relative xpaths and saxon:evaluate. It seems saxon:evaluate understands only
> absolute paths that starts from the root element.
>
>  I am using saxon processor in oXygen.
>
>  The following is sample xquery and data files, my application is
> different.
>  XQuery:
>  <Authors>
>  {
>    (: Step One I get the dynamic path from paths.xml file  :)
>    let $author_path := data(doc('paths.xml')/Xpaths/Author_Path)
>    for $elem2 in doc('Books.xml')/Books/Book  (:Get book elements:)
>        return $elem2/saxon:evaluate($author_path)  (: Want to navigate a
> book element here but it does not work:)
>  }
> </Authors>
>  ------------------------------------------------------------
> Data file books.xml
> <Books>
>     <Book>
>        <author>John</author>
>        <Title>XQuery</Title>
>    </Book>
>    <Book>
>        <author>Tim</author>
>        <Title>XSLT</Title>
>    </Book>
> </Books>
>
> ---------------------------------------------------------------------------------------------
> File that contains xpaths that will be loaded and run dynamically
> paths.xml
>  <Xpaths>
>     <Author_Path>  /author[1]  </Author_Path>
> </Xpaths>
>
> --------------------------------------------------------------------------------------------
>
>  The query returns nothing , when I use static path  return
> $elem2/author[1]
> it works. When I change the path stored in paths.xml to
> /Books/Book/author[1] it returns all authors in each iteration.
>  <Authors>
>    <author>John</author>
>    <author>Tim</author>
>    <author>John</author>
>    <author>Tim</author>
>  </Authors>
>
>  I appreciate any help
>
>  Thank you
> Hisham
>
>
>
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