repository/conf/synapse-config/registry.xml

<?xml version="1.0" encoding="ISO-8859-1"?>       
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<!-- the SimpleURLRegistry allows access to a URL based registry (e.g. file:/// or http://) -->
<registry xmlns="http://ws.apache.org/ns/synapse"
          provider="org.apache.synapse.registry.url.SimpleURLRegistry">
    <!-- the root property of the simple URL registry helps resolve a resource URL as root + key -->
    <parameter name="root">file:repository/conf/sample/resources/</parameter>
    <!-- all resources loaded from the URL registry would be cached for this number of milli seconds -->
    <parameter name="cachableDuration">15000</parameter>
</registry>