Re: [xsl] how to test if a child node have a specific name?

["Chen Yi" <chen_yi36@xxxxxxxxxxx>]

Thanks for you advise.
But I still have a question.
I think the following expresstion is correct.
> > <xsl:if test="name(child::node()[1])='NodeName'">
> >   ...
> > </xsl:if>

And as I am a new beginner of XSLT, I am confused what's the difference 
between the term Node and Element, Can you kindly 
explain it to me ? Thanks.

Chen Yi


> From: "G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx>
> Reply-To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject: Re: [xsl] how to test if a child node have a specific name?
> Date: Fri, 28 May 2004 09:14:35 -0400
>
> At 2004-05-28 20:52 +0800, Chen Yi wrote:
> > I want to test if the first child node is a specific name 
> > "NodeName" node.I use the following expression.
> >
> > <xsl:if test="child::node()[1]=NodeName">
> >   ...
> > </xsl:if>
> >
> > But it doesn't work.
>
> Two problems:
>
> (1) the first of the child nodes might not be an element (when 
> people type XML they often put newline sequences at the end of start 
> tags creating text nodes as the first child node)
>
> (2) your second operand is evaluated as the text content of the 
> first child name "NodeName", which isn't what you want.
>
> > Then I changed the expression to
> > <xsl:if test="child::node()[1]='NodeName'">
> >   ...
> > </xsl:if>
> >
> > or
> > <xsl:if test="name(child::node()[1])='NodeName'">
> >   ...
> > </xsl:if>
> >
> > They all seem work.
>
> But they are not namespace-safe (even though you aren't yet using 
> namespaces), and it seems you are lucky that the first child node is 
> not a text node.  And I'm surprised the first of those actually 
> works since you are not testing the name of the node but rather you 
> are testing the text content of the node.
>
> > I want to know which one is the correct one?
>
> I suggest "none of the above" ... I would suggest the "correct" 
> answer would be:
>
>    test="child::*[1][self::NodeName]"
>
> as this first looks at all children elements (ignoring child text 
> nodes), filters out only the first one, and then filters that one as 
> being an element with the name "NodeName".  The resulting node set 
> is empty if the element is not as desired, and non-empty if the 
> element is as desired, resulting in the associated false/true 
> boolean test.  Using this style of check will allow you to migrate 
> safely to namespace-qualified element types, as in:
>
>    test="child::*[1][self::ns:NodeName]"
>
> I hope this helps.
>
> ............................ Ken
>
> --
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