How to show information passed between elements?

[survex]

Say I have to components on component diagram and I want to show that component A passes class DATA to component B.
A--[DATA]-->B.

Yes, I can use information flow connector for that, but it is useless for me because I need to see the structure of class DATA.

The same is for communication diagram, when I want to show what object is being passed between elements.

Is there any practices to solve such problems?

[qwerty]

When using information flow you can specify the classes which are being conveyed. Isn't that what you want to do?

q.

[survex]

When using information flow you can specify the classes which are being conveyed. Isn't that what you want to do?

q.

Information flow doesn't show contents of data being passed, only elements name. I want to show what object and what attributes are being passed.

information flow: A--[DATA]-->B
I want to show: A--[DATA{attribute1=value1,attribute2=value2}]-->B

[qwerty]

For that purpose OMG has standardized sequence diagrams.

q.