Subject: RE: [xsl] avoiding NaN-result in string processing due to missing elements From: "Michael Kay" <mike@xxxxxxxxxxxx> Date: Mon, 1 Dec 2008 17:02:09 -0000 |
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@xxxxxxxxxxxxx [mailto:cavecatem@xxxxxxxxxxxxx] > Sent: 01 December 2008 17:32 > To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx > 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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