1. A method of providing publish-subscribe communications, the method comprising: receiving, using a processing device, a format and an event published by an event publisher, the event publisher being associated with a first domain, wherein the format is published by the event publisher in a proprietary extensible markup language schema; assigning, using the processing device, a priority and one of a plurality of second domains by an event broker to each of a plurality of event subscribers, wherein the priority is assigned based on which of the plurality of second domains each of the plurality of subscribers is assigned; storing, using the processing device, the proprietary extensible markup language schema by the event broker; comparing, using the processing device, the event to the proprietary extensible markup language schema by the event broker to confirm that the event is legitimate; modifying, using the processing device, the event format by an event subscriber request; processing, using the processing device, the event by the event broker based on a rule and the priority; and providing, using the processing device, the event to the plurality of event subscribers in accordance with the priority after each of the plurality of event subscribers is authenticated by declaring the second domain to which the event subscriber is assigned.