About the element, 'expiration-setting' in the orion-web.xml

Question

orion-web.dtd says
<!-- Specifies the Expires setting for a given set of resources, useful for caching policies (for instance for browsers not to reload images as frequently as documents etc). -->
<!ELEMENT expiration-setting (#PCDATA)>
<!ATTLIST expiration-setting expires CDATA #IMPLIED
url-pattern CDATA #IMPLIED
>
I thought this element will help for tuning.
My question is,
if there is a frequently accessed images, and url-pattern is "http://image.myserver.com", i assumed the syntax like the following,
<expiration-setting expire="?" url-pattern="http://image.myserver.com">
but i don't know what's the meaning of the attribute value 'expire'? And big or small one in my situation? and Basically does it work in the oc4j server?
null

Answer 1

See
Oracle® Application Server Performance Guide
*10g Release 2 (10.1.2)*
*6.6 Improving Servlet Performance in Oracle Application Server*
Here is an example:
--- snip ---
<PRE>
<orion-web-app
deployment-version="2.0.0.0"
jsp-cache-directory="./persistence"
temporary-directory="./temp"
servlet-webdir="/servlet/">
<!-- Session-tracking settings for this application.
Do not use cookies to track servlet sessions -->
<session-tracking cookies="disabled"/>
<expiration-setting expires="86400" url-pattern="*.jar"/>
<expiration-setting expires="never" url-pattern="*.gif"/>
</orion-web-app>
</PRE>
--- snap ---