Re: Correlation between two xml trees

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Subject: Re: Correlation between two xml trees
From: Joerg Heinicke <joerg.heinicke@xxxxxx>
Date: Thu, 06 Jun 2002 18:37:17 +0200

Hello John,

it's not so difficult:

$data stores the z:row, you are currently processing. So with $data you can easily access this z:row. With the for-each you switch the context away from the z:row to $outputdef. The columns in $outputdef have an attribute @dbcolumn, which is normally accessed via <xsl:value-of select="@dbcolumn"/>.

Now from the z:row in $data you want to get the value of either @col1, @col2 or @col3. The attribute you want to access is stored in @dbcolumn. So you want to have the value of this attribute, whose name is the same as the value stored in @dbcolumn.

$data/@* means "all attributes of the z:row stored in $data".

The predicate [] restricts the selection of this expression. Everything in the predicate refers to the node/attribute/etc. directly before the predicate. So @*[name()] means the name() of the attribute.

With current() we switch the context away from these attributes to the context element, which is at the moment a column from $outputdef/root/cloumn (see for-each).

So

$data/@*[name()=current()/@dbcolumn]

means

return the value of all the attributes, whose name() is the same as the value of the @dbcolumn of the currently processed element. Of course this is only one. (<xsl:value-of/> also selects always only the value of the first node/attribute in a nodeset.)

I hope, this explanation was not to much,to less or to buggy ;-)

Regards,

Joerg

John Sands wrote:

Hi Joerg,

Thank you very much. It works, but I'd like to understand it.

<xsl:template match="z:row">
  <data>
    <xsl:variable name="data" select="."/>
    <xsl:for-each select="$outputdef/root/column">
      <xsl:element name="{@tagname}">
        <xsl:value-of select="$data/@*[name()=current()/@dbcolumn]"/>
      </xsl:element>
    </xsl:for-each>
  </data>
</xsl:template>

I understand the use of the xsl:variable, but the rest of the expression
is still baffling to me:

select="$data/@*[name()=current()/@dbcolumn]"

Can you explain what it does, please?

Thanks,
John Sands

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Current Thread
Re: Correlation between two xml trees, (continued) Joerg Heinicke - Thu, 6 Jun 2002 01:10:25 -0400 (EDT) John Sands - Thu, 6 Jun 2002 08:00:24 -0400 (EDT) Antonio Fiol - Thu, 6 Jun 2002 08:10:13 -0400 (EDT) John Sands - Thu, 6 Jun 2002 12:56:06 -0400 (EDT) Joerg Heinicke - Thu, 6 Jun 2002 12:49:45 -0400 (EDT) <= John Sands - Fri, 7 Jun 2002 08:15:58 -0400 (EDT)

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