Re: [xsl] Doing math in XSLT?

["Martin Honnen martin.honnen@xxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

On 01/04/2024 20:37, dvint@xxxxxxxxx wrote:
> I have the following XML
>
> <row>
> B B B B <entry nameend="col2" namest="col1">
> B B B B B B B  <p>OpenID Connect client settings</p>
> B B B B B B B  <note
> B B B B B B B B B B B  id="note_N1055C"
> B B B B B B B B B B B  >The following parameters are only applicable
> B B B B B B B B B B B  when this client supports the OpenID Connect use
> B B B B B B B B B B B  cases.</note>
> B B B B </entry>
> </row>
>
> The attributes nameend="col2" namest="col1" indicate that this row
> spans 2 columns (end - start + 1).
>
> I've tried this to try and get the numbers 1 and 2 from these strings,
> but I get NaN errors
>
> <xsl:variable name="start"
> B B B B select="number(substring-after(@namest, 'col'))" as="xs:double"/>
> <xsl:variable name="end"
> B B B B select="number(substring-after(@nameend, 'col'))" as="xs:double"/>
>
> I've tried this in different combinations with/without the
> as="xs:double" and number() and those variations throw the same error.


For me a template


B  <xsl:template match="entry">
<xsl:variable name="start"
B B B  select="number(substring-after(@namest, 'col'))" as="xs:double"/>
<xsl:variable name="end"
B B B  select="number(substring-after(@nameend, 'col'))" as="xs:double"/>
B B B  <xsl:comment>{$end - $start + 1}</xsl:comment>
B  </xsl:template>

doesn't give any error with Saxon HE 12 and outputs e.g. <!--2--> for
your sample XML.


Please show us minimal but complete code that gives that error and tell
us which XSLT processor and version you use.