<outbound-rule> element

Zero or more. This is very similar to a normal rule but it is used for rewriting urls that go through response.encodeURL().

May contain "run", "from", "to" and "set" element(s) also. Example:

<outbound-rule>
<from>^/world.jsp?country=([a-z]+)&amp;city=([a-z]+)$</from>
<to>/world/$1/$2</to>
</outbound-rule>

Using the example above JSP's with the code
<a href="<%= response.encodeURL("/world.jsp?country=usa&amp;city=nyc") %>">nyc</a>
will output
<a href="/world/usa/nyc">nyc</a>

Or JSTL
<a href="<c:url value="/world.jsp?country=${country}&amp;city=${city}" />">nyc</a>
will output
<a href="/world/usa/nyc">nyc</a>

Note, If you are using JSTL (ie, <c:url) this will work also.
URLREWRITE.XML

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE urlrewrite PUBLIC "-//tuckey.org//DTD UrlRewrite 3.1//EN"
        "http://tuckey.org/res/dtds/urlrewrite3.1.dtd">

<urlrewrite use-query-string="true">
    <rule>
        <from>/show_([0-9]+)_([a-z]+).html</from>
        <to>/show.do?id=$1&amp;data=$2</to>
    </rule>
    <outbound-rule>
        <from>/show.do\?id=([0-9]+)&amp;data=([a-z]+)</from>
        <to>/show_$1_$2.html</to>
    </outbound-rule>

</urlrewrite>

<a href="<c:url value="/show.do?id=111&data=rewrite"/>">click me!</a>