Recursive change of the value of attributes

In this example we want to change a value of attribute if it already exists and to preserve all other attributes intact. The xsl:copy-of in this example copies all attributes with the exception of the one we want to change.

xsl:apply-templates without the select attribute applies templates to all children nodes (text, elements, ...) - the recursive step. The other xsl:apply-template processes existing "r" attributes. The xsl:attribute multiplies the value of this attribute by 5, or more precisely creates a new attribute with the same name and with value based on the original value.

XSLT

      <xsl:stylesheet
                  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                  version="2.0">
            <xsl:output  method="xml"
                        indent="yes"
                        omit-xml-declaration="yes"/>

            <xsl:template  match="*">
                  <xsl:copy>
                        <xsl:copy-of  select="@*[name() != 'r']"/>
                        <xsl:apply-templates  select="@r"/>
                        <xsl:apply-templates/>
                  </xsl:copy>
            </xsl:template>

            <xsl:template  match="@r">
                  <xsl:attribute  name="r"
                              select=". * 5"/>
            </xsl:template>

      </xsl:stylesheet>

XML

Output

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