[xquery-talk] xpath1 text node contains attribute, equivalent in xpath2

Misztur, Chris CMisztur at macleanfogg.com
Fri Dec 27 08:02:07 PST 2013

The period '.' in contains() means that you are passing the current sequence item (aka context) into the contains() function.
Imagine that query [1] is actually doing a for-each loop on each <title/> and the predicate in square brackets is applying a 'where' statement on each iteration.  You can also rewrite query [1] as query [3].

Your other query [2] returned multiple items or a sequence of strings.  You did not specify a predicate / selection criteria so you got an 'array' of strings.

[1] fn:doc("xmldatabasefile.xml")/bookstore/book/title[fn:contains(.,'Learning XML')]
[2] fn:doc("xmldatabasefile.xml")/bookstore/book/title/text()
[3] for $book-title in doc('xmldatabasefile.xml')/bookstore/book/title
        Where contains($book-title/text(), 'Learning XML')
        Return $book-title/text()

-----Original Message-----
From: talk-bounces at x-query.com [mailto:talk-bounces at x-query.com] On Behalf Of e-letter
Sent: Friday, December 27, 2013 6:04 AM
To: liam at w3.org
Cc: talk at x-query.com
Subject: Re: [xquery-talk] xpath1 text node contains attribute, equivalent in xpath2

On 27/12/2013, Liam R E Quin <liam at w3.org> wrote:
> On Fri, 2013-12-27 at 09:20 +0000, e-letter wrote:
>> Xpath1 specification § 4.2 string functions
>> (http://www.w3.org/TR/xpath/#section-String-Functions) describes a
>> "contains" function, but this was not found in xpath2;
> Better to use the XPath 2 Functions and Operators spec, which does
> indeed list fn:contains().

                let $x := fn:doc("xmldatabasefile.xml")/bookstore/book/title[fn:contains(.,'Learning
                return $x


         <book category="WEB">

            <title lang="en">
                                Learning XML


            <author>Erik T. Ray</author>




Why is the full stop applied before the comma, because this is not specified as an option in the specification about 'fn:contains'?

>> Is it possible to remove the xml elements from the output file?
> Change return $x to return $x/text() maybe

Not quite, returns:



if 'return' is changed to 'return $x/element()', the result is as 'return $x', but interestingly a removal of new line white space.

talk at x-query.com


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