While inbound networking of sources and stream functions may be restricted over internet, zipper will be exposed for chaining up the routes of data stream. zipper will be:

• keep data immutable
• orchestrate stream function workflow
• zipper is a yomo-server, when act as a upstream zipper, it is also a yomo-client
• separate to upstream zipper and downstream zipper
• one upstream zipper can be route data to multiple downstream zippers concurrently.
• one downstream zipper can be connected by multiple upstream zippers