how to get id value of the items by clicking

Here is my problem and i totaly want a advice it will be helpful to me.
I want to add two items in my plot (for example two svg items). First item is ID1 second item is ID2.
when i clicked on first svg item it should be emit a signal, similarly when i clicked second svgitem it should be emit another signal. But i dont want to use coordinates of items.
My aim is this, items must say to me their IDs when i click on them. **But i don't want to use coordinates of items. I can not figure it out how, please give me an advise.

Regards.