Subject: RE: [xsl] Testing 2 XML documents for equality - a solution From: "Jim Neff" <jneff@xxxxxxxxxxxxxxx> Date: Wed, 30 Mar 2005 10:35:09 -0500 |
What if the nodes are not in the same order? From my understanding, XSLT doesn't care (nor should it) the order of sibling nodes (nodes at the same level). Maybe we could do some pre-processing to massage our source documents into some order if your going to do just one equals test. Some other things to consider, If this were a very large document, would it be faster to look for obvious differences first, like same number of nodes at each level (if there weren't a lot of levels it wouldn't take much time--depends on structure of expected documents though). I guess we are trying to avoid going through each and every node in one document, reading its name and value, then comparing it with every other node in the second document. Great idea though. --Jim > -----Original Message----- > From: Mukul Gandhi [mailto:mukul_gandhi@xxxxxxxxx] > Sent: Wednesday, March 30, 2005 10:29 AM > To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx > Subject: [xsl] Testing 2 XML documents for equality - a solution > > Hello, > I was playing with XSLT. I thought could there be a nice > way (with XSLT 1.0) to test 2 XML documents for equality. Two > XML documents will be considered equal if all their nodes are > identical(i.e. element, text, attribute, namespace etc). > > I found few approaches for this in the FAQ (URL - > http://www.dpawson.co.uk/xsl/sect2/N1777.html) . > Indeed they are good work.. But I could come up with an > elegant way. It uses no extension functions. Below is the XSLT .. > > <?xml version="1.0"?> > <xsl:stylesheet > xmlns:xsl="http://www.w3.org/1999/XSL/Transform" > version="1.0"> > > <xsl:output method="text" /> > > <!-- parameter for "ignoring white-space only text nodes" > during comparison --> > <!-- if iws='y', "white-space only text nodes" will not be > considered during comparison --> <xsl:param name="iws" /> > > <xsl:variable name="doc1" > select="document('file1.xml')" /> > <xsl:variable name="doc2" > select="document('file2.xml')" /> > > <xsl:template match="/"> > > <!-- store hash of 1st document into a variable; > it is concatination of name and values of all nodes --> > <xsl:variable name="one"> > <xsl:for-each select="$doc1//@*"> > <xsl:value-of select="name()" /><xsl:value-of select="." /> > </xsl:for-each> > <xsl:choose> > <xsl:when test="$iws='y'"> > <xsl:for-each > select="$doc1//node()[not(normalize-space(self::text()) > = '')]"> > <xsl:value-of select="name()" > /><xsl:value-of select="." /> > </xsl:for-each> > </xsl:when> > <xsl:otherwise> > <xsl:for-each select="$doc1//node()"> > <xsl:value-of select="name()" /><xsl:value-of select="." /> > </xsl:for-each> > </xsl:otherwise> > </xsl:choose> > </xsl:variable> > > <!-- store hash of 2nd document into a variable; > it is concatination of name and values of all nodes --> > <xsl:variable name="two"> > <xsl:for-each select="$doc2//@*"> > <xsl:value-of select="name()" /><xsl:value-of select="." /> > </xsl:for-each> > <xsl:choose> > <xsl:when test="$iws='y'"> > <xsl:for-each > select="$doc2//node()[not(normalize-space(self::text()) > = '')]"> > <xsl:value-of select="name()" > /><xsl:value-of select="." /> > </xsl:for-each> > </xsl:when> > <xsl:otherwise> > <xsl:for-each select="$doc2//node()"> > <xsl:value-of select="name()" > /><xsl:value-of select="." /> > </xsl:for-each> > </xsl:otherwise> > </xsl:choose> > </xsl:variable> > <xsl:choose> > <xsl:when test="$one = $two"> > Equal > </xsl:when> > <xsl:otherwise> > Not equal > </xsl:otherwise> > </xsl:choose> > </xsl:template> > > </xsl:stylesheet> > > In this stylesheet, I am relying on 2 features - > node() function and @* . node() function matches any node > other than an attribute node and the root node. > While @* matches any attribute. So I guess this XSLT can > cater to all cases ;) . I have done limited testing with > "element, text and attribute nodes only" > and have got favourable results.. > > Another feature that I have incorporated in the stylesheet > is, "controlling whether white space only text nodes should > be considered during comparison". > This is done with a stylesheet parameter iws. If it is "y", > white space only text nodes will be ignored during > comparison. If it is other than "y" or is not supplied, white > space only text nodes will make a difference to the 2 documents. > > If anybody cares to test this stylesheet and report any > observations, I'll be happy! > > Regards, > Mukul > > > > > __________________________________ > Do you Yahoo!? > Yahoo! Small Business - Try our new resources site! > http://smallbusiness.yahoo.com/resources/
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