If you want the output for this case to be an empty string, you could do
<xsl:decimal-format NaN=""/>
But I think I would write:
select="rdf:Description/(tiff:XResolution | @tiff:XResolution)/
format-number(number(substring-before(.,'/'),
number(substring-after(.,'/'))"
which would return an empty sequence if the element/attribute does not
exist, and value-of outputs nothing if you select an empty sequence.
Michael Kay
http://www.saxonica.com/
-----Original Message-----
From: cavecatem(_at_)directbox(_dot_)com
[mailto:cavecatem(_at_)directbox(_dot_)com]
Sent: 01 December 2008 17:32
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: [xsl] avoiding NaN-result in string processing due
to missing elements
Dear List,
I'm working with XSLT 2.0 and Saxon 8B to process Adobe
XMP-format image meta data for display in HTML. I'm using
Oxygen 7.1 to work it out.
XMP stores numerical values as Strings, e.g.
<tiff:XResolution>2400000/10000</tiff:XResolution> and I
managed to work out how to convert such a string into a useful number:
<xsl:value-of
select="format-number(number(substring-before((rdf:Description
/(tiff:XResolution | @tiff:XResolution)), '/')) div
number(substring-after((rdf:Description/(tiff:XResolution |
@tiff:XResolution)),'/')),'#######.')"/>
The problem is: If the element (or attribute, both are
allowed in XMP) does not exist, the result I get in NaN (not
a number).
A possible solution is to query for the element/attribute first
<xsl:if test="rdf:Description/(tiff:XResolution |
@tiff:XResolution)">
<xsl:value-of select ...
</xsl:if>
Is there another way to do this?
Thanks. I'm on the digest version of the lists, so I cannot
answer questions until tomorrow.
Regards
CJ
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