Re: [xep-support] Index Sort Problem (no index output produced when sort statement is used)

From: G. Ken Holman (gkholman@CraneSoftwrights.com)
Date: Wed Feb 18 2004 - 14:10:19 PST

  • Next message: Chris Cosentino: "Re: [xep-support] Index Sort Problem (no index output produced when sort statement is used)"

    At 2004-02-18 13:58 -0500, Chris Cosentino wrote:
    >I'm experiencing some odd behavior with sort.
    >...
    >My code to generate the index, unsorted, works fine:
    >
    ><xsl:template name="index">
    ><fo:block>
    >INDEX
    ><xsl:for-each select="//indexentry">
    > <fo:block font="11pt Times" space-before.optimum="6pt">
    >...
    ></fo:block>
    ></xsl:template>
    >
    >However, the following produces no output after "INDEX":
    >
    ><xsl:template name="index">
    ><fo:block>
    >INDEX
    ><xsl:for-each select="//indexentry">
    > <xsl:sort>
    > <fo:block font="11pt Times" space-before.optimum="6pt">
    > <fo:wrapper text-transform="lowercase">
    > <xsl:value-of select="."/>
    > <fo:leader leader-pattern="dots"/>
    > <fo:page-number-citation ref-id="{generate-id()}"/>
    > </fo:wrapper>
    > </fo:block>
    > </xsl:sort>
    > </xsl:for-each>
    ></fo:block>
    ></xsl:template>

    Right ... you've structured it incorrectly

    >No variation of the initial sort tag seems to work either (granted my
    >select statements may be grasping at straws, but I tried EVERYTHING,
    >several times):
    >
    ><xsl:sort select = ".">
    ><xsl:sort select = "//indexentry">
    ><xsl:sort select = "indexentry">
    ><xsl:sort order-"descending">
    >
    >Any idea why absolutely no index is output when I put a sort statement in
    >there, even the most basic sort with no options?

    Yes ... you haven't learned that <xsl:sort/> is an *empty* element ... the
    select attribute should be a relative specification, but it has *no*
    content. It is a modifier of the <xsl:for-each> instruction.

    Try:

    <xsl:template name="index">
    <fo:block>
    INDEX
    <xsl:for-each select="//indexentry">
             <xsl:sort/>
             <fo:block font="11pt Times" space-before.optimum="6pt">
                 <fo:wrapper text-transform="lowercase">
                 <xsl:value-of select="."/>
                 <fo:leader leader-pattern="dots"/>
                 <fo:page-number-citation ref-id="{generate-id()}"/>
                 </fo:wrapper>
             </fo:block>
    </xsl:for-each>
    </fo:block>
    </xsl:template>

    >Obviously I need to read up on XPath a little better for my select
    >statements, but I still don't understand why nothing is output with even
    >just a basic sort.

    All you've done is improperly formed the instruction. Your XSLT processor
    should have flagged the illegal content to <xsl:sort/> ... it is an empty
    instruction.

    I hope this helps.

    ................... Ken 

    --
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