is possible to use attributes/variable in application's properties file

[Bright Chen]

Hi,
is possible to use attributes/variable in application's properties file? 

For example the configuration of TelecomDemo which configure the topic for 
dimension query result as following:
<property>
    <name>dt.application.TelecomDemoV2.operator.CDRGeoQueryResult.topic</name>
    <value>CDRGeoQueryResult</value>
</property>

Could I change it to some like following
<property>
    <name>dt.application.TelecomDemoV2.operator.CDRGeoQueryResult.topic</name>
    <value>CDRGeoQueryResult-${appName}</value>
</property>

And I expected result is that there are two instances( say one name is 
“TelecomDemoV2”, another is “TelecomDemoV21”) of this application run in same 
gateway, 
And they will use different topics "CDRGeoQueryResult-TelecomDemoV2” and 
"CDRGeoQueryResult-TelecomDemoV21”

thanks
Bright