RE: Showing unique rows at multiple levels

Actually, I meant something like:

<xsl:stylesheet version="1.0"
       xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<xsl:key name="bookshelves" match="bookshelf" use="." />
<xsl:key name="authors"     match="author"    use="concat(../bookshelf,
'-', .)" />
<xsl:key name="publishers"  match="publisher" use="concat(../bookshelf,
'-', ../author, '-', .)" />

<xsl:template match="books">
    <xsl:apply-templates select="book/bookshelf">
         <xsl:sort select="."/>
    </xsl:apply-templates>
</xsl:template>

<xsl:template match="bookshelf">
    <xsl:if test="generate-id(.) = generate-id(key('bookshelves',
.)[1])">
        <xsl:variable name="bookshelfVar" select="."/>
        <xsl:variable name="authorVar" select="../author"/>

        <xsl:text>&#10;</xsl:text>
        <xsl:value-of select="."/>

        <xsl:apply-templates select="/books/book[(bookshelf =
$bookshelfVar)]/author">
            <xsl:sort select="."/>
        </xsl:apply-templates>
    </xsl:if>
</xsl:template>

<xsl:template match="author">
    <xsl:if test="generate-id(.) = generate-id(key('authors',
concat(../bookshelf, '-', .))[1])">
        <xsl:variable name="bookshelfVar" select="../bookshelf"/>
        <xsl:variable name="authorVar" select="."/>

        <xsl:text>&#10;--</xsl:text>
        <xsl:value-of select="."/>

        <xsl:apply-templates select="/books/book[(bookshelf =
$bookshelfVar) and (author = $authorVar)]/publisher">
            <xsl:sort select="."/>
        </xsl:apply-templates>
    </xsl:if>
</xsl:template>

<xsl:template match="publisher">
    <xsl:if test="generate-id(.) = generate-id(key('publishers',
concat(../bookshelf, '-', ../author, '-', .))[1])">
        <xsl:text>&#10;----</xsl:text>
        <xsl:value-of select="."/>
    </xsl:if>
</xsl:template>

</xsl:stylesheet>

It replaces // by explicit paths and preceding axis by keyed indexes..

Kind regards,
Geert

>


Drs. G.P.H. Josten
Consultant



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> Van: Geert Josten [mailto:geert.josten@xxxxxxxxxxx]
> Verzonden: donderdag 5 oktober 2006 8:13
> Aan: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Onderwerp: RE:  Showing unique rows at multiple levels
>
> Hi,
>
> Your expression "//book[(bookshelf =
> $bookshelfVar)]/author[not(.=preceding::author)]" is too
> strict (the predicate too tolerant). You need to limit the
> preceding::author part to match only authors that are on the
> same bookshelf. Similar thing for the publisher. :-)
>
> Besides, I would recommend trying to use keys and grouping
> techniques like the Muenchian method. Something like:
>
> (at top-level)
>
> <xsl:key name="bookshelfs" match="bookshelf" use="." />
> <xsl:key name="authors" match="author"
> use="concat(../bookshelf, '-', .)" />
>
> (inside bookshelf template)
>
> <xsl:for-each select="key('bookshelfs', .)[1]">
>   ...
> </xsl:for-each>
>
> (inside author template)
>
> <xsl:for-each select="key('authors', concat(../bookshelf, '-', .)[1]">
>   ...
> </xsl:for-each>
>
> Probably a lot quicker if your data file becomes larger.
> Using // is usually very expensive in that case..
>
> Kind regards,
> Geert