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xsl-transform-policy.md

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title Azure API Management policy reference - xsl-transform | Microsoft Docs
description Reference for the xsl-transform policy available for use in Azure API Management. Provides policy usage, settings, and examples.
services api-management
author dlepow
ms.service azure-api-management
ms.topic reference
ms.date 07/23/2024
ms.author danlep

Transform XML using an XSLT

[!INCLUDE api-management-availability-all-tiers]

The xsl-transform policy applies an XSL transformation to XML in the request or response body.

[!INCLUDE api-management-policy-generic-alert]

Policy statement

<xsl-transform>
    <parameter parameter-name="...">...</parameter>
    <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
        <xsl:.../>
        <xsl:.../>
    </xsl:stylesheet>
  </xsl-transform>

Elements

Name Description Required
parameter Used to define variables used in the transform No
xsl:stylesheet Root stylesheet element. All elements and attributes defined within follow the standard XSLT specification. Yes

Usage

Usage notes

  • This policy can only be used once in a policy section.
  • Currently, this policy supports XSLT version 1.0.

Examples

Transform request body

<inbound>
    <base />
    <xsl-transform>
        <parameter name="User-Agent">@(context.Request.Headers.GetValueOrDefault("User-Agent","non-specified"))</parameter>
        <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
            <xsl:output method="xml" indent="yes" />
            <xsl:param name="User-Agent" />
            <xsl:template match="* | @* | node()">
                <xsl:copy>
                    <xsl:if test="self::* and not(parent::*)">
                        <xsl:attribute name="User-Agent">
                            <xsl:value-of select="$User-Agent" />
                        </xsl:attribute>
                    </xsl:if>
                    <xsl:apply-templates select="* | @* | node()" />
                </xsl:copy>
            </xsl:template>
        </xsl:stylesheet>
      </xsl-transform>
</inbound>

Transform response body

<policies>
  <inbound>
      <base />
  </inbound>
  <outbound>
      <base />
      <xsl-transform>
          <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
            <xsl:output omit-xml-declaration="yes" method="xml" indent="yes" />
            <!-- Copy all nodes directly-->
            <xsl:template match="node()| @*|*">
                <xsl:copy>
                    <xsl:apply-templates select="@* | node()|*" />
                </xsl:copy>
            </xsl:template>
          </xsl:stylesheet>
    </xsl-transform>
  </outbound>
</policies>

Related policies

[!INCLUDE api-management-policy-ref-next-steps]