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Ronan HayesSubject: Recursively Mathcing up two XML Schemas?
Author: Ronan Hayes
Date: 14 Feb 2006 05:01 AM
I have 2 XML Schemas, one is from an older version while another is from a newer version of my application.

Basically the majority of the elements are the same, and instead of going through the 5000 nodes, and potentially missing 1 or 2 or worse yet mapping something to the wrong spot.

Is it possible just to map all elements with the same name, (and possibly under the same parent using stylus?)

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Minollo I.Subject: Recursively Mathcing up two XML Schemas?
Author: Minollo I.
Date: 14 Feb 2006 09:03 AM
If most of the structures match, then it's probably easier to build a mapper "by difference", by using <xsl:copy-of> for unchanged trees and by skipping/modifying elements that are gone/changed.

So, you could have something like (I'm typing without checking syntax, so forgive my errors)...
<xsl:template match="/">
<xsl:apply-templates/>
</xsl:template>

<xsl:template match="deletedElement1">
<!-- do nothing -->
</xsl:template>

<xsl:template match="renamedElement2">
<newElement2>
<xsl:for-each select="@*">
<xsl:attribute name="{name()}">
<xsl:value-of select="."/>
</xsl:attribute>
</xsl:for-each>
<xsl:apply-templates/>
</newElement2>
</xsl:template>

<xsl:template match="*"> <!-- normal case -->
<xsl:element name={name()}>
<xsl:for-each select="@*">
<xsl:attribute name="{name()}">
<xsl:value-of select="."/>
</xsl:attribute>
</xsl:for-each>
<xsl:apply-templates/>
</xsl:element>
</xsl:template>

Hope this helps,
Minollo

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Ronan HayesSubject: Recursively Mathcing up two XML Schemas?
Author: Ronan Hayes
Date: 14 Feb 2006 09:55 AM
Originally Posted: 14 Feb 2006 09:30 AM
Not 100% clear on whats going on there, but I wll take a closer read in a second.<br> <br> The problem with the approach above, is that I am not 100% as to what has been changed, hence why I was hoping for a recursive style <br> <br> eg: <?xml version="1.0" encoding="UTF-8"?> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"> <xsl:template match="/test"> <diff> <xsl:call-template name="compareNodes"> <xsl:with-param name="curNode" select="."/> <xsl:with-param name="ghostNode" select="document('comp2.xml')/test"/> <xsl:with-param name="repPath" select="'/test'"/> </xsl:call-template> </diff> </xsl:template> <xsl:template name="compareNodes"> <xsl:param name="curNode"/> <xsl:param name="ghostNode"/> <xsl:param name="repPath"/> <xsl:choose> <xsl:when test="*"> <xsl:for-each select="*"> <xsl:variable name="cname" select="name()"/> <xsl:choose> <xsl:when test="$ghostNode/*[name() = $cname]"> <xsl:call-template name="compareNodes"> <xsl:with-param name="curNode" select="."/> <xsl:with-param name="ghostNode" select="$ghostNode/*[name() = $cname]"/> <xsl:with-param name="repPath" select="concat($repPath, '/', $cname)"/> </xsl:call-template> </xsl:when> <xsl:otherwise> <missingPath><xsl:value-of select="concat($repPath, '/', $cname)"/></missingPath> </xsl:otherwise> </xsl:choose> </xsl:for-each> </xsl:when> </xsl:choose> </xsl:template> </xsl:stylesheet> Any ideas on how to adapt the copy-of to this similar style? <br> <br> Basically what I do know, is that each Schema has the same root, and potentially the same structure, just with varios elements being added or removed, depending on how the schemas have been updated. I want to remain generic and flexible, so that in 3 months time when the schema is changed again, that the application still functions correctly.

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Minollo I.Subject: Recursively Mathcing up two XML Schemas?
Author: Minollo I.
Date: 14 Feb 2006 09:37 AM
I'm sure you can come up with different solutions similar to what you have sketched out; but I have the feelings you are ending up simulating the pattern matching XSLT processing algorithm manually...

The approach I suggested earlier is indeed recursive; the <xsl:apply-templates/> instruction will make XSLT scan the children of the current node and apply the proper template based on the matching pattern.

Minollo

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Ronan HayesSubject: Recursively Mathcing up two XML Schemas?
Author: Ronan Hayes
Date: 14 Feb 2006 09:41 AM
Ok, sorry new to XSLT and trying to get my head around it

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Ronan HayesSubject: Recursively Mathcing up two XML Schemas?
Author: Ronan Hayes
Date: 14 Feb 2006 10:02 AM
You mention about using <xsl:copy-of> in your first post, yet your example doesnt use it??

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Minollo I.Subject: Recursively Mathcing up two XML Schemas?
Author: Minollo I.
Date: 14 Feb 2006 10:39 AM
You can use <xsl:copy-of> for those branches/sub-branches that you know need to be copied verbatim with no changes; so, if you know that your <order> element, for example, needs to be copies "as is", you could simply do:

<xsl:template match="order">
<xsl:copy-of select="."/>
</xsl:template>

That would simplify and speed up processing clearly.

Minollo

 
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