Subject: Re: To self or not to self
From: Martin Honnen <Martin.Honnen@xxxxxx>
Date: Fri, 27 Jan 2012 16:21:55 +0100
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ihe onwuka wrote:
I wanted to isolate the figure element that has a figure as an
immediate preceding sibling.
<section role="All_models">
<title>All models</title>
<figure role="Harness_multi-plug">
<title>ECU harness multi-plug</title>
<mediaobject>
<imageobject>
<imagedata fileref="78650"/>
</imageobject>
</mediaobject>
</figure>
<figure role="Circuit_diagram">
<title>System circuit diagram</title>
<mediaobject>
<imageobject>
<imagedata fileref="31544"/>
</imageobject>
</mediaobject>
</figure>
</section>
I settled on //figure/preceding-sibling::*[1][figure] but it gave back
nothing and would only work when I used the explicit form of the self
axis.
Well [figure] checks wether there is a child element named figure, not
whether the element itself is a figure element.
I settled on //figure/preceding-sibling::*[1][self::figure]
However if I want the title element immediately preceding figure I
don't need to use the explicit form. This works
//figure/preceding-sibling::*[1][title]
So what is going on in this particular case (because I don't
understand the difference), and in general when is explicit self
required.
The same here, [title] checks whether there is a child element named
"title", only in your XML that is the case.
--
Martin Honnen --- MVP Data Platform Development
http://msmvps.com/blogs/martin_honnen/
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