Re: [xsl] Select previous sibling where attribute is not empty

[David Carlisle <davidc@xxxxxxxxx>]

On 13/04/2010 16:03, Mathieu Malaterre wrote:
> Hi there,
>
>    I am trying to select preceding-sibling::row[1] or
> preceding-sibling::row[2] in the following example. Of course '1' or
> '2' are hardcoded, and instead I need to express instead " where
> entry/@morerows != '' "
>
> Here is my Input.xml:
>
>     <informaltable frame="all">
>        <tgroup cols="3.782608695652174"><tbody><row>
>              <entry morerows="2">
>                 <para>Study</para>
>              </entry>
>              <entry>
>                 <para>General Study</para>
>              </entry>
>              <entry>
>                 <para>C.7.2.1</para>
>              </entry>
>              <entry>
>                 <para>M</para>
>              </entry>
>           </row>
>           <row>
>              <entry>
>                 <para>Patient Study</para>
>              </entry>
>              <entry>
>                 <para>C.7.2.2</para>
>              </entry>
>              <entry>
>                 <para>U</para>
>              </entry>
>           </row>
>           <row>
>              <entry>
>                 <para>Clinical Trial Study</para>
>              </entry>
>              <entry>
>                 <para>C.7.2.3</para>
>              </entry>
>              <entry>
>                 <para>U</para>
>              </entry>
>           </row></tbody></tgroup>
>     </informaltable>
>
>
> My current xsl script is:
>
>    <xsl:template match="row">
>      <xsl:message>
>      <xsl:if test="count(entry) = 3">
>        <xsl:value-of select="preceding-sibling::row[entry/@morerows != '' ]"/>
>      </xsl:if>
>      </xsl:message>
>    </xsl:template>
>
>
> Thanks for suggestions,



entry/@morerows != ''

as a general rule never use != if either operand is a sequence (or a 
simpler rule, never use !=  at all) There are times when you want to 
break this rule but they are rather infrequent. The semantics of 
not(entry/@morerows = '') are far simpler (and far more frequently 
desired) than those of entry/@morerows != ''

I'm not at all clear what your requirement is, if you want the nearest
row that doesn't have an entry with a morerows attribute then that would be

preceding-sibling::row[not(entry/@morerows)][1]

David








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