from reads the xml file your uri points to.
the to endpoint then transforms your xml into html. You just have to output the
generated html to a file by again using the file-component.
<?xml version="1.0" encoding="UTF-8"?>
<blueprint
xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.osgi.org/xmlns/blueprint/v1.0.0
http://www.osgi.org/xmlns/blueprint/v1.0.0/blueprint.xsd">
<camelContext xmlns="http://camel.apache.org/schema/blueprint">
<route>
<from uri="file:start.xml"/>
<to uri="xsl:design.xsl"/>
<to uri="file:target?fileName=output.html"/>
</route>
</camelContext>
</blueprint>