Hi Fraser,
On 11/9/05, Fraser Goffin <goffinf(_at_)hotmail(_dot_)com> wrote:
Does anyone know a good way of comparing aspects of two XML instance
documents using XSLT. The number of possible differences may be large so I
would prefer not to have to create a hard coded test for each
Instead of explicitly testing for all possible occurences, I would
compare two documents in a different way.
I would create two variables:
<xsl:variable name="Doc1" select="/*"/>
<xsl:variable name="Doc2" select="document('foo.xml')/*"/>
Then go recursively through the elements first through $Doc1,
comparing this to $Doc2, then through $Doc2 comparing to $Doc1.
I have written a very scetchy (and unfinished) part of what I would
do, here. Perhaps you can use it, perhaps not.
<xsl:template match="/">
<xsl:apply-templates select="$Doc1" mode="Doc1-vs-Doc2"/>
<xsl:apply-templates select="$Doc1" mode="Doc2-vs-Doc1"/>
</xsl:template>
<xsl:template match="*" mode="Doc1-vs-Doc2">
<xsl:param name="doc2" select="$Doc2"/>
<xsl:choose>
<xsl:when test="local-name()!=local-name($doc2)">
<xsl:apply-templates select="@*" mode="Doc1-vs-Doc2">
<xsl:with-param name="doc2" select="$doc2"/>
</xsl:apply-templates>
<xsl:for-each select="*">
<xsl:variable name="pos" select="position()"/>
<xsl:apply-temlates select="." mode="Doc1-vs-Doc2">
<xsl:with-param name="doc2" select="$doc2/*[position()=$pos]"/>
</xsl:apply-templates>
</xsl:for-each>
</xsl:when>
<xsl:otherwise>
<Mismatch Type="Doc1-vs-Doc2">
<NotExist><xsl:value-of select="local-name()"/></NotExist>
</Mismatch>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
Regards,
Ragulf Pickaxe :-)
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