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Re: [xsl] How to get a "heading" from an element

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On Sat, 9 Feb 2002 12:52:40 +0000, you wrote:

>Hi Roger,
>
>> I'm having a real problem with something apparently simple.
>
>This is a grouping problem. You want to group the airline elements in
>your source document into groups according to their airline-name.
>
>From the looks of it, the airline elements are listed in order, and
>the kind of grouping that you want to do just involves adding a header
>at the top of each group. That means you can use something quite
>simple to do the grouping.
>
>Iterate over the airline elements one by one; I'd apply templates to
>them as follows:
>
>  <xsl:apply-templates select="airline" />
>
>Then have a template that matches airline elements:
>
><xsl:template match="airline">
>  ...
></xsl:template>
>
>But of course you could use an xsl:for-each instead if you're more
>comfortable with it.
>
>For each airline element, you want to create a row that contains a
>cell for the airport-code and a cell for the airport-name, as follows:
>
>  <tr>
>    <td><xsl:value-of select="airport-code" /></td>
>    <td><xsl:value-of select="airport-name" /></td>
>  </tr>
>
>Then for certain airline elements, you want to add a header before
>this row. The airline elements where you need to add a header are
>those that are the first with a particular airline-name. Given that
>your file is sorted, you can tell which are first with a particular
>airline-name by looking at their immediately preceding sibling airline
>(if they have one). If the airline-name of the immediately preceding
>sibling airline is different from the airline-name of this airline,
>then it's the first in a group.
>
>You can get the immediately preceding sibling airline with:
>
>  preceding-sibling::airline[1]
>
>You can compare its airline-name with this airline's airline-name
>with:
>
>  preceding-sibling::airline[1]/airline-name != airline-name
>
>And you can use an xsl:if to decide, on the basis of this test,
>whether to add the header or not. So the content of the xsl:template
>or xsl:for-each would be:
>
>  <xsl:if test="preceding-sibling::airline[1]/airline-name !=
>                airline-name">
>    <tr>
>      <td><xsl:value-of select="airline-name" /></td>
>    </tr>
>  </xsl:if>
>  <tr>
>    <td><xsl:value-of select="airport-code" /></td>
>    <td><xsl:value-of select="airport-name" /></td>
>  </tr>
>
Thanks for this! I had just one problem, ie the very first
airline-name didn't come out, so I changed the above to:

<xsl:variable name="var-num"><xsl:number/></xsl:variable>
<xsl:if test="$var-num = 1">
    <tr>
      <td><xsl:value-of select="airline-name" /></td>
    </tr>
</xsl:if>
 <xsl:if test="preceding-sibling::airline[1]/airline-name !=
airline-name">
    <tr>
      <td><xsl:value-of select="airline-name" /></td>
    </tr>
  </xsl:if>
  <tr>
    <td><xsl:value-of select="airport-code" /></td>
    <td><xsl:value-of select="airport-name" /></td>
  </tr>

It works, but is there a better way?

Roger.
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