4. Config file modularity
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## 4. Config file modularity

Metaproxy XML configuration snippets can be reused by other filters using the `XInclude` standard, as seen in the `/etc/config-sru-to-z3950.xml` example SRU configuration.

        <filter id="sru" type="sru_z3950">
          <database name="Default">
           <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
                        href="explain.xml"/>
          </database>
        </filter>

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