SDG's XML Schema (XSD) does not allow the developer to specify 'timeout' and 'action' values for CustomExpiry (<gfe:custom-entry-[ttl|tti]>) on Region attributes.

Using Spring Data GemFire's XML schema and namespace (XSD), there is currently no way for a developer to specify custom expiration settings (i.e. com.gemstone.gemfire.cache.CustomExpiry) in the Region attributes for Region Entry Expiration, either for Time-To-Live (TTL) or Idle Timeout (TTI).

So, for example, the following snippet of GemFire cache.xml cannot be full represented in SDG's XML namespace...

// cache.xml

<region-attributes statistics-enabled="true">
   <entry-idle-time>
       <expiration-attributes timeout="60" action="local-invalidate">
           <custom-expiry>
               <class-name>com.megaconglomerate.mypackage.MyClass</class-name>
           </custom-expiry>
       </expiration-attributes>
   </entry-idle-time>
</region-attributes>

The corresponding (but incomplete) SDG configuration meta-data is...

// {applicationContext.xml}}

<gfe:partitioned-region id="Example" statistics="true">
  <gfe:custom-entry-tti>
    <bean class=com.megaconglomerate.mypackage.MyClass"/>
  </gfe:custom-entry-tti>
</gfe:partitioned-region>

As you can see, there is no way to specify the 'timeout' and corresponding 'action' attributes in SDG XML.