The Definitions element represents the top XML element. It contains the namespaces required for BPMN 2.0:
Semantic
The Semantic element defines the namespace for the semantic elements.
bpmndi
The bpmndi element defines the namespace for the graphic elements.
dc
The dc element defines the elements for the graphic style.
di
The di element defines the elements for the textual style.
The Semantic element defines the namespace for the semantic elements.
The ID consists of the ARISBPMN_ string and the GUID of the BPMN diagram. In addition, the target namespace http://www.softwareag.com/bpmn2Serialisation/ is specified and the name of the model attached.
This definition element is a container element for all other elements and their subordinate elements.