Subject: RE: [xsl] Testing 2 XML documents for equality - a solution From: "Bondarenko, Taras" <TBondarenko@xxxxxxxx> Date: Wed, 30 Mar 2005 10:55:47 -0500 |
Tried on two files with additional external reference to entities file like this: File one: <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE article SYSTEM "ent1.ent"> <article> <p>Some text &m-dash; to test</p> </article> File two: <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE article SYSTEM "ent2.ent"> <article> <p>Some text &m-dash; to test</p> </article> Although there are two different entity files they have identical entity definitions: <?xml version="1.0" encoding="UTF-8"?> <!ENTITY m-dash "—"> Test result: documents are Equal. Which makes sense for XML, but I guess whatever goes into DOCTYPE can change this. When I change the entity definition in ent2.ent to, say <!ENTITY m-dash "•"> Test result: Not equal -----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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