Event log: supress events with event data equals to minus sign ('-')

<QueryList>

  <Query Id="0" Path="Security">

    <Select Path="Security">*[System[(EventID=4625)]]</Select>

    <Suppress Path="Security">*[EventData[Data[@Name='IpAddress'] and (Data='-')]]</Suppress>

  </Query>

</QueryList>

This supresses all events because I believe this indicates a range that includes everything. Or maybe I'm wrong, however no events shows up in the view.

How can I suppress events with '-' in one of the event data properties?

Thanks a lot,

Boaz.