View the bpmn file in integrated web browser

I was trying to view the previously drawn bpmn diagram for example today I draw half diagram and tomorrow I want to see that half draw diagram and continue that drawing then how can it possible because I integrate the properties panel example in that they didn’t gave open functionality only download functionality provided. Like here we can open diagram even they provided left hand side corner open image button like that I want to implement.
is it available readily? if not please give me some idea for that?


you can use the importXML method from the Viewer/Modeler to create a new diagram from XML.