Modify attribute of certain XML elements
I would like to modify an attribute of a very long xml like this:
<element index="0">
<subelement bla="asdf" />
<subelement bla="asdf" />
</element>
<element index="1">
<subelement bla="asdf" />
<subelement bla="asdf" />
</element>
...
I need to add N the value of each index attribute. Say N=5. The result would be:
<element index="5">
<subelement bla="asdf" />
&l开发者_C百科t;subelement bla="asdf" />
</element>
<element index="6">
<subelement bla="asdf" />
<subelement bla="asdf" />
</element>
...
What's the easiest way to do this? I presume it would be with XSLT, but I don't know how to do it.
Thanks!
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
<xsl:output method="xml" indent="yes"/>
<!-- copy everything verbatim -->
<xsl:template match="@*|node()">
<xsl:copy>
<xsl:apply-templates select="@*|node()" />
</xsl:copy>
</xsl:template>
<!-- except "element" nodes -->
<xsl:template match="element">
<xsl:copy>
<xsl:attribute name="index">
<xsl:value-of select="@index + 5"/>
</xsl:attribute>
<xsl:apply-templates />
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
svick answer it's a good solution. Just in case you have to keep exact structure, try:
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
<xsl:param name="increment" select="5" />
<xsl:template match="@*|node()">
<xsl:copy>
<xsl:apply-templates select="@*|node()" />
</xsl:copy>
</xsl:template>
<xsl:template match="node()[not(node())]">
<xsl:element name="{name()}" >
<xsl:apply-templates select="@*" />
</xsl:element>
</xsl:template>
<xsl:template match="element/@index">
<xsl:attribute name="index">
<xsl:value-of select="$increment + ." />
</xsl:attribute>
</xsl:template>
</xsl:stylesheet>
Here's a somewhat general solution for an arbitrary attribute to increase:
#!/bin/bash
PROG=$(basename $0 )
: ${TMPDIR:=/tmp}
: ${INC:=1}
TMPFILE=$TMPDIR/$PROG.$$.xml
function usage() {
cat <<!
$PROG <attribute> <input-xml>
Increases all attributes named <attribute> in the <input-xml> XML file by 1 ( or \$INC )
!
exit 1
}
[ $# -eq 2 ] || usage
{
cat <<!
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
<xsl:output method="xml" indent="yes"/>
<!-- copy everything verbatim -->
<xsl:template match="@*|node()">
<xsl:copy>
<xsl:apply-templates select="@*|node()" />
</xsl:copy>
</xsl:template>
<!-- except "attribute-of-interest" node -->
<xsl:template match="@$1">
<xsl:attribute name="$1">
<xsl:value-of select=". + $INC"/>
</xsl:attribute>
</xsl:template>
</xsl:stylesheet>
!
} xsltproc /dev/stdin $2 > $TMPFILE && mv $TMPFILE $2
Clearly this is svick's answer. I changed the XSL somewhat to cover multiple attributes in the target element. FWIW, I templatized it using bash.
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