The configuration block for SubscriptionAggregatorSource looks like this:

<Content
    xmlns:agg="http://mds.globus.org/aggregator/types"
    xsi:type="agg:AggregatorContent">
    <agg:AggregatorConfig xsi:type="agg:AggregatorConfig">
        <agg:AggregatorSubscriptionType>
            <TopicExpression Dialect="dialect">
            Topic Expression
            </TopicExpression>
            <Precondition Dialect="dialect">
            Precondition
            </Precondition>
            <Selector Dialect="dialect">
            Selector
            </Selector>
            <SubscriptionPolicy>
            Subscription Policy
            </SubscriptionPolicy>
            <InitialTerminationTime>time</InitialTerminationTime>
        </agg:AggregatorSubscriptionType>
    </agg:AggregatorConfig>
    <agg:AggregatorData/>
</Content>

where:

For more information, see this section of the Java WS Core Developer's Guide.