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From a WIS 2.0 perspective, open standard message protocols using the publish-subscribe pattern are considered to be Web services.
Digital resources may be made available through multiple Web services. For example, a NC may publish SYNOPTIC reports via both download downloads (e.g. a user queries the service to access data - "pull") and real-time delivery (e.g. a user subscribes to the service and data is sent when available - "push").
Many Message Switching Systems (MSS) already use the channels concept to organize the distribution of data. MSS could be amended to support these new data exchange methods, thereby minimising disruption to the core business of NMHS (i.e. internal, national and international data distribution).
GISCs already offer a subscription service for globally exchanged data, although none use modern messaging protocols to achieve this.
As specified in the Manual on WIS (WMO-No. 1060) Part III. Functions of WIS: ยง3.5.5 Maintain a 24-hour cache - GISCs retain the responsibility to operate a 24-hour cache of data within their Area of Responsibility.
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