SeismogramAttr, Seismogram, Channel, Station, Network, Origin and all of the Server Traits extend the PropertyContainer valuetype in the IDL. The property container essentially functions as a Map in java or a Dictionary in other languages. It gives a place for the server to insert additional information about these objects that isn't contained in the IDL.

The properties on an object are for server to client communication, not for local storage results pertaining to the object that are within the client.

Examples

• BUD SeismogramDC adds a FARM or SPYDER source property to the Seismograms it returns
• a nonauthoritative EventDC for a catalog could put a reference to the authoritative server for origins that it returns from that catalog.

As actual usages of the properties crop up, it'd be nice to document them here.