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Usage of XPath in the attribute values - curly brackets "{}"

If an attribute contains one or more curly brackets their contents is evaluated as an XPath expression. Several curly brackets optionally separated by some text can be used in attribute 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="/*">
                  <xxx  x="{@r + @s}"
                              y="{@r}-{@s}-{@r}.xxx"
                              z="@p={@p}"/>
            </xsl:template>

      </xsl:stylesheet>
XML

      <aaa  r="3"
                  s="11"
                  p="qqq"/>
Output

      <xxx  x="14"
                  y="3-11-3.xxx"
                  z="@p=qqq"/>


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