web.config transform xml element

I'm getting rid of web.config configuration batch file (Hanselman's) and want to use the config transformation feature in vs2010. However I'm having a bit of trouble figuring out of to transform an xml element (as opposed to an attribu开发者_开发知识库te on an element).

This is a snippet from my web.config:

<Federation type="..." xmlns="...">
      <SigningCertificate .../>
      <AllowedAudienceUris>
               <Audience>https://audience.url.com</Audience>
      </AllowedAudienceUris>
</Federation>

I want to transform the element by inserting a different url based on the build configuration - can this be done?

Thanks in advance!

/Jasper

If the AllowedAudienceUris and Audience elements occur only once, omitting the xdt:Locator is also fine:

<?xml version="1.0"?>
<configuration xmlns:xdt="http://schemas.microsoft.com/XML-Document-Transform">
  <Federation>
    <AllowedAudienceUris xdt:Transform="Replace">
      <Audience>https://example.com</Audience>
    </AllowedAudienceUris>
  </Federation>
</configuration>

You should be able to do this using the xdt:Locator and xdt:Transform attributes.

<?xml version="1.0"?>
<configuration xmlns:xdt="http://schemas.microsoft.com/XML-Document-Transform">
  <Federation>
    <AllowedAudienceUris
        xdt:Transform="Replace"
        xdt:Locator="Condition(//Audience)">
      <Audience>https://example.com</Audience>
    </AllowedAudienceUris>
  </Federation>
</configuration>

One approach would be the following:

<!-- Copy all nodes -->
<xsl:template match="@* | node()">
    <xsl:copy>
        <xsl:apply-templates select="@* | node()"/>
    </xsl:copy>
</xsl:template>

<!-- Operate just on the AllowedAudienceUris (copy it), setting the Audience element -->
<xsl:template match="/Federation/AllowedAudienceUris">
    <xsl:copy>
        <Audience>https://hello.com</Audience>
    </xsl:copy>
</xsl:template>