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: [email protected] [mailto:[email protected]] On Behalf Of
e-letter
Sent: Friday, December 27, 2013 6:04 AM
To: [email protected]
Cc: [email protected]
Subject: Re: [xquery-talk] xpath1 text node contains attribute, equivalent in
xpath2
On 27/12/2013, Liam R E Quin <[email protected]> wrote:
> On Fri, 2013-12-27 at 09:20 +0000, e-letter wrote:
>> Xpath1 specification ยง 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
XML')]/parent::*
return $x
}
returns:
...<p>
<book category="WEB">
<title lang="en">
Learning XML
</title>
<author>Erik T. Ray</author>
<year>2003</year>
<price>39.95</price>
</book>
</p>...
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:
...<p>
</p>...
if 'return' is changed to 'return $x/element()', the result is as 'return $x',
but interestingly a removal of new line white space.
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