I am looking for a way to show duplicate data-stores in data-flow diagrams (DFD). With "duplicate" I mean multiple occurrences of the same symbol to avoid too many crossing flows.
In Gane & Sarson's DFD notation, duplicate data-stores are indicated by adding an extra vertical line to the left of the open ended data-store rectangle. Another website suggested adding an asterisk next to the data store name.
But I was unable to find any guidance for Yourdon/DeMarco's DFD notation, which uses different symbols. Is there a generally accepted way to represent duplicate data-stores with Yourdon/DeMarco? Or should I adopt one of the methods stated above?