Flow action xslt

The xslt action performs an XSL 1.0 Transformation on DOM content.


  • src="..." path to the XSLT file (required)
  • cache="..." controls whether the XSLT compiler cache shall used (optional, default is true). Cache usage depends on the FIT_XSLT_USE_CACHE setting in fit.ini.
  • in="..." to define the input location (optional, default is fit://request/content)
  • out="..." to define the output location (optional, default is fit://request/content)


The action reads the in content. If the input is no DOM, the action tries to parse the content automatically. The XSLT code is read from the file defined in src. The XSLT is then compiled (or read from the in-memory cache). The transformation generates a new content (usually a DOM), that is written to out.

The <xsl:output> element is important for the action to work. The method may be html and xml that generate a new DOM or text that generates an output string. The encoding and media-type attributes are passed on to the meta data of the FIDJ location. If you process the main content, it will be passed to the client as Content-type header.

The XSLT cache stores a compiled representation of the XSLT stylesheet in the process memory. This is usually recommended, because it avoids re-parsing and re-compiling the same code over and over again. The action uses the modification time of the src file to invalidate the cache. This means that the cache does not consider xsl:include, xsl:import or x:include directives that you may have used to spread your XSLT code over multiple files to determine if a cache entry is still up to date. You may clear the XSLT cache by executing fitadmin maintenance clearcache for your project. Alternatively, you can completely turn off caching if it hinders your development process. Then, if possible, re-enable caching when the site goes in production.


<xslt src="myXSLT.xsl" />
<xslt src="fit://site/config/myXSLT.xsl" cache="false" />
<xslt src="myXSLT.xsl" in="fit://request/content/test" out="fit://request/content/test" />

A simple HTML copy transformation looks like this:

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

<xsl:output method="html" />

<!-- your templates here -->
<xsl:template match="div[@class='special']" >
  <div class="very special">
    <div>this is a special tag</div>
    <xsl:apply-templates />

<xsl:template match="node() | @*">
    <xsl:apply-templates select="@* | node()"/>



If you rather want to generate a new document with your xslt action than transforming an existing DOM, you can use in="fit://request/empty". This special location always returns <empty/>.

You can clear the XSLT cache with the fitadmin command line tool using the --xslt option:

$ fitadmin maintenance clearcache --xslt myproject


The following errors are considered fatal and terminate the request:

  • XSLT not given or not found
  • XSLT empty
  • XSLT has syntax or compile errors

The following errors are considered non-fatal. The flow will continue, no content will be written to out.

  • The in document is not present, empty or no DOM
  • The transformation raises runtime errors