snaker-core/src/main/java/org/snaker/engine/core/Execution.java
public Execution createSubExecution(Execution execution, Process process, String parentNodeName) {
		return new Execution(execution, process, parentNodeName);
	}
public Execution createSubExecution(Execution execution, Process process, String parentNodeName) {
		return new Execution(execution, process, parentNodeName);
	}
根据当前执行对象execution、子流程定义process、当前节点名称产生子流程的执行对象
@param execution
@param process
@param parentNodeName
@return